Retirement Benefits - Fair Values of Pension Plan and Other Postretirement Benefit Plan Assets (Details) - USD ($)
$ in Millions |
Dec. 31, 2018 |
Dec. 31, 2017 |
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
100.00%
|
|
| Actual plan asset allocations (as percent) |
100.00%
|
|
| Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 11,631
|
$ 12,901
|
| Target plan asset allocations (as percent) |
|
100.00%
|
| Actual plan asset allocations (as percent) |
|
100.00%
|
| Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 3,132
|
$ 4,041
|
| Target plan asset allocations (as percent) |
26.00%
|
26.00%
|
| Actual plan asset allocations (as percent) |
28.00%
|
31.00%
|
| Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 2,669
|
$ 3,124
|
| Target plan asset allocations (as percent) |
25.00%
|
25.00%
|
| Actual plan asset allocations (as percent) |
25.00%
|
25.00%
|
| Pension plans | Fixed income |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
23.00%
|
23.00%
|
| Actual plan asset allocations (as percent) |
24.00%
|
24.00%
|
| Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 930
|
$ 926
|
| Pension plans | Mortgage- and asset-backed securities |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
7
|
8
|
| Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1,195
|
1,241
|
| Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
654
|
650
|
| Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
272
|
385
|
| Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 1,780
|
$ 1,676
|
| Target plan asset allocations (as percent) |
14.00%
|
14.00%
|
| Actual plan asset allocations (as percent) |
15.00%
|
13.00%
|
| Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 171
|
$ 180
|
| Target plan asset allocations (as percent) |
3.00%
|
3.00%
|
| Actual plan asset allocations (as percent) |
1.00%
|
1.00%
|
| Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 821
|
$ 670
|
| Target plan asset allocations (as percent) |
9.00%
|
9.00%
|
| Actual plan asset allocations (as percent) |
7.00%
|
6.00%
|
| Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 926
|
$ 1,048
|
| Target plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Actual plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 176
|
$ 239
|
| Target plan asset allocations (as percent) |
39.00%
|
37.00%
|
| Actual plan asset allocations (as percent) |
40.00%
|
40.00%
|
| Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 120
|
$ 145
|
| Target plan asset allocations (as percent) |
23.00%
|
23.00%
|
| Actual plan asset allocations (as percent) |
22.00%
|
23.00%
|
| Other postretirement benefit plans | Fixed income |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
29.00%
|
30.00%
|
| Actual plan asset allocations (as percent) |
30.00%
|
29.00%
|
| Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 34
|
$ 32
|
| Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
35
|
37
|
| Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
81
|
79
|
| Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
13
|
13
|
| Other postretirement benefit plans | Trust-owned life insurance |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
386
|
426
|
| Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 53
|
$ 52
|
| Target plan asset allocations (as percent) |
5.00%
|
5.00%
|
| Actual plan asset allocations (as percent) |
5.00%
|
5.00%
|
| Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 4
|
$ 5
|
| Target plan asset allocations (as percent) |
1.00%
|
1.00%
|
| Actual plan asset allocations (as percent) |
0.00%
|
1.00%
|
| Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 24
|
$ 20
|
| Target plan asset allocations (as percent) |
3.00%
|
4.00%
|
| Actual plan asset allocations (as percent) |
3.00%
|
2.00%
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 4,135
|
$ 4,887
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2,102
|
2,559
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1,344
|
1,555
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Mortgage- and asset-backed securities |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
270
|
301
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
419
|
472
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
171
|
210
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
100
|
135
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
45
|
47
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
13
|
12
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Trust-owned life insurance |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
13
|
16
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Significant Other Observable Inputs (Level 2) | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
5,143
|
5,912
|
| Significant Other Observable Inputs (Level 2) | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1,030
|
1,482
|
| Significant Other Observable Inputs (Level 2) | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1,325
|
1,569
|
| Significant Other Observable Inputs (Level 2) | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
930
|
926
|
| Significant Other Observable Inputs (Level 2) | Pension plans | Mortgage- and asset-backed securities |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
7
|
8
|
| Significant Other Observable Inputs (Level 2) | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1,195
|
1,241
|
| Significant Other Observable Inputs (Level 2) | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
654
|
650
|
| Significant Other Observable Inputs (Level 2) | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2
|
36
|
| Significant Other Observable Inputs (Level 2) | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Significant Other Observable Inputs (Level 2) | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Significant Other Observable Inputs (Level 2) | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
687
|
776
|
| Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
76
|
104
|
| Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
75
|
98
|
| Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
34
|
32
|
| Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
35
|
37
|
| Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
81
|
79
|
| Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Trust-owned life insurance |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
386
|
426
|
| Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Net Asset Value as a Practical Expedient | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2,353
|
2,102
|
| Net Asset Value as a Practical Expedient | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Net Asset Value as a Practical Expedient | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Net Asset Value as a Practical Expedient | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Net Asset Value as a Practical Expedient | Pension plans | Mortgage- and asset-backed securities |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Net Asset Value as a Practical Expedient | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Net Asset Value as a Practical Expedient | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Net Asset Value as a Practical Expedient | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
48
|
| Net Asset Value as a Practical Expedient | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1,361
|
1,204
|
| Net Asset Value as a Practical Expedient | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
171
|
180
|
| Net Asset Value as a Practical Expedient | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
821
|
670
|
| Net Asset Value as a Practical Expedient | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
68
|
62
|
| Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Net Asset Value as a Practical Expedient | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Net Asset Value as a Practical Expedient | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
1
|
| Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Trust-owned life insurance |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
40
|
36
|
| Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
4
|
5
|
| Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
24
|
20
|
| Alabama Power | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 2,579
|
$ 2,844
|
| Target plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Actual plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Alabama Power | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 694
|
$ 848
|
| Target plan asset allocations (as percent) |
26.00%
|
26.00%
|
| Actual plan asset allocations (as percent) |
28.00%
|
31.00%
|
| Alabama Power | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 591
|
$ 703
|
| Target plan asset allocations (as percent) |
25.00%
|
25.00%
|
| Actual plan asset allocations (as percent) |
25.00%
|
25.00%
|
| Alabama Power | Pension plans | Fixed income |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
23.00%
|
23.00%
|
| Actual plan asset allocations (as percent) |
24.00%
|
24.00%
|
| Alabama Power | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 206
|
$ 200
|
| Alabama Power | Pension plans | Mortgage- and asset-backed securities |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2
|
2
|
| Alabama Power | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
265
|
286
|
| Alabama Power | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
145
|
155
|
| Alabama Power | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
61
|
54
|
| Alabama Power | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 395
|
$ 394
|
| Target plan asset allocations (as percent) |
14.00%
|
14.00%
|
| Actual plan asset allocations (as percent) |
15.00%
|
13.00%
|
| Alabama Power | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 38
|
$ 43
|
| Target plan asset allocations (as percent) |
3.00%
|
3.00%
|
| Actual plan asset allocations (as percent) |
1.00%
|
1.00%
|
| Alabama Power | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 182
|
$ 159
|
| Target plan asset allocations (as percent) |
9.00%
|
9.00%
|
| Actual plan asset allocations (as percent) |
7.00%
|
6.00%
|
| Alabama Power | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 359
|
$ 405
|
| Target plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Actual plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Alabama Power | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 45
|
$ 64
|
| Target plan asset allocations (as percent) |
43.00%
|
42.00%
|
| Actual plan asset allocations (as percent) |
45.00%
|
44.00%
|
| Alabama Power | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 24
|
$ 30
|
| Target plan asset allocations (as percent) |
21.00%
|
22.00%
|
| Actual plan asset allocations (as percent) |
21.00%
|
22.00%
|
| Alabama Power | Other postretirement benefit plans | Fixed income |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
28.00%
|
28.00%
|
| Actual plan asset allocations (as percent) |
28.00%
|
28.00%
|
| Alabama Power | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 10
|
$ 11
|
| Alabama Power | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
11
|
12
|
| Alabama Power | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
6
|
7
|
| Alabama Power | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
3
|
2
|
| Alabama Power | Other postretirement benefit plans | Trust-owned life insurance |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
233
|
253
|
| Alabama Power | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 17
|
$ 17
|
| Target plan asset allocations (as percent) |
4.00%
|
4.00%
|
| Actual plan asset allocations (as percent) |
4.00%
|
4.00%
|
| Alabama Power | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 2
|
$ 2
|
| Target plan asset allocations (as percent) |
1.00%
|
1.00%
|
| Actual plan asset allocations (as percent) |
0.00%
|
0.00%
|
| Alabama Power | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 8
|
$ 7
|
| Target plan asset allocations (as percent) |
3.00%
|
3.00%
|
| Actual plan asset allocations (as percent) |
2.00%
|
2.00%
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 917
|
$ 1,104
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
466
|
572
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
298
|
370
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Mortgage- and asset-backed securities |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
60
|
51
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
93
|
111
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
54
|
75
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
35
|
52
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
12
|
16
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
3
|
2
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Trust-owned life insurance |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
4
|
5
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1,140
|
1,255
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
228
|
276
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
293
|
333
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
206
|
200
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Mortgage- and asset-backed securities |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2
|
2
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
265
|
286
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
145
|
155
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1
|
3
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
282
|
309
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
10
|
12
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
12
|
14
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
10
|
11
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
11
|
12
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
6
|
7
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Trust-owned life insurance |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
233
|
253
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Net Asset Value as a Practical Expedient | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
522
|
485
|
| Alabama Power | Net Asset Value as a Practical Expedient | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Net Asset Value as a Practical Expedient | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Net Asset Value as a Practical Expedient | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Net Asset Value as a Practical Expedient | Pension plans | Mortgage- and asset-backed securities |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Net Asset Value as a Practical Expedient | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Net Asset Value as a Practical Expedient | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Net Asset Value as a Practical Expedient | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Net Asset Value as a Practical Expedient | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
302
|
283
|
| Alabama Power | Net Asset Value as a Practical Expedient | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
38
|
43
|
| Alabama Power | Net Asset Value as a Practical Expedient | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
182
|
159
|
| Alabama Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
23
|
21
|
| Alabama Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Trust-owned life insurance |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Alabama Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
13
|
12
|
| Alabama Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2
|
2
|
| Alabama Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
8
|
7
|
| Georgia Power | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 3,669
|
$ 4,069
|
| Target plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Actual plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Georgia Power | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 988
|
$ 1,213
|
| Target plan asset allocations (as percent) |
26.00%
|
26.00%
|
| Actual plan asset allocations (as percent) |
28.00%
|
31.00%
|
| Georgia Power | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 842
|
$ 1,006
|
| Target plan asset allocations (as percent) |
25.00%
|
25.00%
|
| Actual plan asset allocations (as percent) |
25.00%
|
25.00%
|
| Georgia Power | Pension plans | Fixed income |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
23.00%
|
23.00%
|
| Actual plan asset allocations (as percent) |
24.00%
|
24.00%
|
| Georgia Power | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 294
|
$ 286
|
| Georgia Power | Pension plans | Mortgage- and asset-backed securities |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2
|
3
|
| Georgia Power | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
377
|
409
|
| Georgia Power | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
206
|
221
|
| Georgia Power | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
86
|
78
|
| Georgia Power | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 561
|
$ 564
|
| Target plan asset allocations (as percent) |
14.00%
|
14.00%
|
| Actual plan asset allocations (as percent) |
15.00%
|
13.00%
|
| Georgia Power | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 54
|
$ 61
|
| Target plan asset allocations (as percent) |
3.00%
|
3.00%
|
| Actual plan asset allocations (as percent) |
1.00%
|
1.00%
|
| Georgia Power | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 259
|
$ 228
|
| Target plan asset allocations (as percent) |
9.00%
|
9.00%
|
| Actual plan asset allocations (as percent) |
7.00%
|
6.00%
|
| Georgia Power | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 342
|
$ 384
|
| Target plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Actual plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Georgia Power | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 50
|
$ 64
|
| Target plan asset allocations (as percent) |
36.00%
|
36.00%
|
| Actual plan asset allocations (as percent) |
35.00%
|
38.00%
|
| Georgia Power | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 49
|
$ 60
|
| Target plan asset allocations (as percent) |
24.00%
|
24.00%
|
| Actual plan asset allocations (as percent) |
24.00%
|
24.00%
|
| Georgia Power | Other postretirement benefit plans | Fixed income |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
33.00%
|
33.00%
|
| Actual plan asset allocations (as percent) |
35.00%
|
31.00%
|
| Georgia Power | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 7
|
$ 6
|
| Georgia Power | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
10
|
11
|
| Georgia Power | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
44
|
41
|
| Georgia Power | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
5
|
4
|
| Georgia Power | Other postretirement benefit plans | Trust-owned life insurance |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
153
|
173
|
| Georgia Power | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 15
|
$ 17
|
| Target plan asset allocations (as percent) |
4.00%
|
4.00%
|
| Actual plan asset allocations (as percent) |
4.00%
|
4.00%
|
| Georgia Power | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 2
|
$ 2
|
| Target plan asset allocations (as percent) |
1.00%
|
1.00%
|
| Actual plan asset allocations (as percent) |
0.00%
|
1.00%
|
| Georgia Power | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 7
|
$ 6
|
| Target plan asset allocations (as percent) |
2.00%
|
2.00%
|
| Actual plan asset allocations (as percent) |
2.00%
|
2.00%
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 1,304
|
$ 1,582
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
663
|
819
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
424
|
529
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Mortgage- and asset-backed securities |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
85
|
74
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
132
|
160
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
67
|
77
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
41
|
53
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
17
|
14
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
5
|
4
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Trust-owned life insurance |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
4
|
6
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1,623
|
1,794
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
325
|
394
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
418
|
477
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
294
|
286
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Mortgage- and asset-backed securities |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2
|
3
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
377
|
409
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
206
|
221
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1
|
4
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
255
|
288
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
9
|
11
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
32
|
46
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
7
|
6
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
10
|
11
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
44
|
41
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Trust-owned life insurance |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
153
|
173
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Net Asset Value as a Practical Expedient | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
742
|
693
|
| Georgia Power | Net Asset Value as a Practical Expedient | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Net Asset Value as a Practical Expedient | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Net Asset Value as a Practical Expedient | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Net Asset Value as a Practical Expedient | Pension plans | Mortgage- and asset-backed securities |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Net Asset Value as a Practical Expedient | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Net Asset Value as a Practical Expedient | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Net Asset Value as a Practical Expedient | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Net Asset Value as a Practical Expedient | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
429
|
404
|
| Georgia Power | Net Asset Value as a Practical Expedient | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
54
|
61
|
| Georgia Power | Net Asset Value as a Practical Expedient | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
259
|
228
|
| Georgia Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
20
|
19
|
| Georgia Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Trust-owned life insurance |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Georgia Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
11
|
11
|
| Georgia Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2
|
2
|
| Georgia Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
7
|
6
|
| Mississippi Power | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 506
|
$ 564
|
| Target plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Actual plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Mississippi Power | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 136
|
$ 168
|
| Target plan asset allocations (as percent) |
26.00%
|
26.00%
|
| Actual plan asset allocations (as percent) |
28.00%
|
31.00%
|
| Mississippi Power | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 118
|
$ 139
|
| Target plan asset allocations (as percent) |
25.00%
|
25.00%
|
| Actual plan asset allocations (as percent) |
25.00%
|
25.00%
|
| Mississippi Power | Pension plans | Fixed income |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
23.00%
|
23.00%
|
| Actual plan asset allocations (as percent) |
24.00%
|
24.00%
|
| Mississippi Power | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 40
|
$ 40
|
| Mississippi Power | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
52
|
56
|
| Mississippi Power | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
28
|
31
|
| Mississippi Power | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
12
|
11
|
| Mississippi Power | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 77
|
$ 78
|
| Target plan asset allocations (as percent) |
14.00%
|
14.00%
|
| Actual plan asset allocations (as percent) |
15.00%
|
13.00%
|
| Mississippi Power | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 7
|
$ 9
|
| Target plan asset allocations (as percent) |
3.00%
|
3.00%
|
| Actual plan asset allocations (as percent) |
1.00%
|
1.00%
|
| Mississippi Power | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 36
|
$ 32
|
| Target plan asset allocations (as percent) |
9.00%
|
9.00%
|
| Actual plan asset allocations (as percent) |
7.00%
|
6.00%
|
| Mississippi Power | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 23
|
$ 24
|
| Target plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Actual plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Mississippi Power | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 5
|
$ 6
|
| Target plan asset allocations (as percent) |
21.00%
|
21.00%
|
| Actual plan asset allocations (as percent) |
22.00%
|
25.00%
|
| Mississippi Power | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 4
|
$ 5
|
| Target plan asset allocations (as percent) |
20.00%
|
21.00%
|
| Actual plan asset allocations (as percent) |
20.00%
|
20.00%
|
| Mississippi Power | Other postretirement benefit plans | Fixed income |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
38.00%
|
37.00%
|
| Actual plan asset allocations (as percent) |
39.00%
|
38.00%
|
| Mississippi Power | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 6
|
$ 5
|
| Mississippi Power | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2
|
2
|
| Mississippi Power | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1
|
1
|
| Mississippi Power | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1
|
1
|
| Mississippi Power | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 3
|
$ 3
|
| Target plan asset allocations (as percent) |
11.00%
|
12.00%
|
| Actual plan asset allocations (as percent) |
12.00%
|
11.00%
|
| Mississippi Power | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 0
|
$ 0
|
| Target plan asset allocations (as percent) |
3.00%
|
2.00%
|
| Actual plan asset allocations (as percent) |
1.00%
|
1.00%
|
| Mississippi Power | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 1
|
$ 1
|
| Target plan asset allocations (as percent) |
7.00%
|
7.00%
|
| Actual plan asset allocations (as percent) |
6.00%
|
5.00%
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 180
|
$ 218
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
91
|
113
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
59
|
73
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
12
|
10
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
18
|
22
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
7
|
9
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
3
|
4
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2
|
3
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1
|
1
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1
|
1
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
224
|
249
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
45
|
55
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
59
|
66
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
40
|
40
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
52
|
56
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
28
|
31
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
1
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
13
|
12
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2
|
2
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2
|
2
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
6
|
5
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2
|
2
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1
|
1
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
102
|
97
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
59
|
56
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
7
|
9
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
36
|
32
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
3
|
3
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2
|
2
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Mississippi Power | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1
|
1
|
| Southern Power | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 124
|
$ 138
|
| Target plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Actual plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Southern Power | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 33
|
$ 41
|
| Target plan asset allocations (as percent) |
26.00%
|
26.00%
|
| Actual plan asset allocations (as percent) |
28.00%
|
31.00%
|
| Southern Power | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 28
|
$ 34
|
| Target plan asset allocations (as percent) |
25.00%
|
25.00%
|
| Actual plan asset allocations (as percent) |
25.00%
|
25.00%
|
| Southern Power | Pension plans | Fixed income |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
23.00%
|
23.00%
|
| Actual plan asset allocations (as percent) |
24.00%
|
24.00%
|
| Southern Power | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 10
|
$ 10
|
| Southern Power | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
13
|
14
|
| Southern Power | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
7
|
8
|
| Southern Power | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
3
|
2
|
| Southern Power | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 19
|
$ 19
|
| Target plan asset allocations (as percent) |
14.00%
|
14.00%
|
| Actual plan asset allocations (as percent) |
15.00%
|
13.00%
|
| Southern Power | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 2
|
$ 2
|
| Target plan asset allocations (as percent) |
3.00%
|
3.00%
|
| Actual plan asset allocations (as percent) |
1.00%
|
1.00%
|
| Southern Power | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 9
|
$ 8
|
| Target plan asset allocations (as percent) |
9.00%
|
9.00%
|
| Actual plan asset allocations (as percent) |
7.00%
|
6.00%
|
| Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 43
|
$ 53
|
| Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
22
|
28
|
| Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
14
|
18
|
| Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
3
|
2
|
| Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
4
|
5
|
| Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Power | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
55
|
61
|
| Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
11
|
13
|
| Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
14
|
16
|
| Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
10
|
10
|
| Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
13
|
14
|
| Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
7
|
8
|
| Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Power | Significant Other Observable Inputs (Level 2) | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Power | Net Asset Value as a Practical Expedient | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
26
|
24
|
| Southern Power | Net Asset Value as a Practical Expedient | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Power | Net Asset Value as a Practical Expedient | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Power | Net Asset Value as a Practical Expedient | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Power | Net Asset Value as a Practical Expedient | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Power | Net Asset Value as a Practical Expedient | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Power | Net Asset Value as a Practical Expedient | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Power | Net Asset Value as a Practical Expedient | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
15
|
14
|
| Southern Power | Net Asset Value as a Practical Expedient | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2
|
2
|
| Southern Power | Net Asset Value as a Practical Expedient | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
9
|
8
|
| Southern Company Gas | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 800
|
945
|
| Target plan asset allocations (as percent) |
100.00%
|
|
| Actual plan asset allocations (as percent) |
100.00%
|
|
| Southern Company Gas | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 216
|
478
|
| Target plan asset allocations (as percent) |
26.00%
|
|
| Actual plan asset allocations (as percent) |
28.00%
|
|
| Southern Company Gas | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 183
|
166
|
| Target plan asset allocations (as percent) |
25.00%
|
|
| Actual plan asset allocations (as percent) |
25.00%
|
|
| Southern Company Gas | Pension plans | Fixed income |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
23.00%
|
|
| Actual plan asset allocations (as percent) |
24.00%
|
|
| Southern Company Gas | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 64
|
85
|
| Southern Company Gas | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
82
|
39
|
| Southern Company Gas | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
45
|
|
| Southern Company Gas | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
19
|
157
|
| Southern Company Gas | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 123
|
19
|
| Target plan asset allocations (as percent) |
14.00%
|
|
| Actual plan asset allocations (as percent) |
15.00%
|
|
| Southern Company Gas | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 12
|
|
| Target plan asset allocations (as percent) |
3.00%
|
|
| Actual plan asset allocations (as percent) |
1.00%
|
|
| Southern Company Gas | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 56
|
1
|
| Target plan asset allocations (as percent) |
9.00%
|
|
| Actual plan asset allocations (as percent) |
7.00%
|
|
| Southern Company Gas | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 96
|
$ 121
|
| Target plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Actual plan asset allocations (as percent) |
100.00%
|
100.00%
|
| Southern Company Gas | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 49
|
$ 72
|
| Target plan asset allocations (as percent) |
51.00%
|
|
| Actual plan asset allocations (as percent) |
51.00%
|
|
| Southern Company Gas | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 18
|
$ 22
|
| Target plan asset allocations (as percent) |
20.00%
|
|
| Actual plan asset allocations (as percent) |
18.00%
|
|
| Southern Company Gas | Other postretirement benefit plans | Fixed income |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
25.00%
|
24.00%
|
| Actual plan asset allocations (as percent) |
28.00%
|
20.00%
|
| Southern Company Gas | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 1
|
|
| Southern Company Gas | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1
|
|
| Southern Company Gas | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
24
|
$ 24
|
| Southern Company Gas | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1
|
$ 3
|
| Southern Company Gas | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 1
|
|
| Target plan asset allocations (as percent) |
2.00%
|
|
| Actual plan asset allocations (as percent) |
2.00%
|
|
| Southern Company Gas | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 0
|
|
| Target plan asset allocations (as percent) |
1.00%
|
|
| Actual plan asset allocations (as percent) |
0.00%
|
|
| Southern Company Gas | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 1
|
|
| Target plan asset allocations (as percent) |
1.00%
|
|
| Actual plan asset allocations (as percent) |
1.00%
|
|
| Southern Company Gas | Other postretirement benefit plans | Equity securities |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
|
72.00%
|
| Actual plan asset allocations (as percent) |
|
76.00%
|
| Southern Company Gas | Other postretirement benefit plans | Cash |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
|
1.00%
|
| Actual plan asset allocations (as percent) |
|
2.00%
|
| Southern Company Gas | Other postretirement benefit plans | Other Types Of Investments |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
|
3.00%
|
| Actual plan asset allocations (as percent) |
|
2.00%
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 285
|
$ 242
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
145
|
155
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
92
|
0
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
19
|
84
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
29
|
3
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
4
|
5
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2
|
3
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1
|
0
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1
|
2
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
|
| Southern Company Gas | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
353
|
638
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
71
|
323
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
91
|
166
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
64
|
85
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
82
|
39
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
45
|
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
25
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
90
|
115
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
47
|
69
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
17
|
22
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1
|
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1
|
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
24
|
24
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
|
| Southern Company Gas | Significant Other Observable Inputs (Level 2) | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Pension plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
162
|
65
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Pension plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Pension plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Pension plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Pension plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Pension plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Pension plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
48
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Pension plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
94
|
16
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Pension plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
12
|
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Pension plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
56
|
1
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Other postretirement benefit plans |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
2
|
1
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Domestic equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | International equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | U.S. Treasury, government, and agency bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Corporate bonds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Pooled funds |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
0
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Cash equivalents and other |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
$ 1
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Real estate investments |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
1
|
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Special situations |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
0
|
|
| Southern Company Gas | Net Asset Value as a Practical Expedient | Other postretirement benefit plans | Private equity |
|
|
| Assets Fair Value |
|
|
| Fair value, plan assets |
$ 1
|
|
| AGL Resources Inc. Retirement Plan | Southern Company Gas | Pension plans |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
100.00%
|
|
| Actual plan asset allocations (as percent) |
|
100.00%
|
| AGL Resources Inc. Retirement Plan | Southern Company Gas | Pension plans | Fixed income |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
15.00%
|
|
| Actual plan asset allocations (as percent) |
|
19.00%
|
| AGL Resources Inc. Retirement Plan | Southern Company Gas | Pension plans | Equity securities |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
53.00%
|
|
| Actual plan asset allocations (as percent) |
|
65.00%
|
| AGL Resources Inc. Retirement Plan | Southern Company Gas | Pension plans | Cash |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
2.00%
|
|
| Actual plan asset allocations (as percent) |
|
6.00%
|
| AGL Resources Inc. Retirement Plan | Southern Company Gas | Pension plans | Other Types Of Investments |
|
|
| Assets Fair Value |
|
|
| Target plan asset allocations (as percent) |
30.00%
|
|
| Actual plan asset allocations (as percent) |
|
10.00%
|