Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions |
6 Months Ended |
12 Months Ended |
Dec. 31, 2016 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
$ 15,207
|
$ 14,757
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
9,048
|
8,205
|
|
| Valuation allowance |
|
(123)
|
(184)
|
|
| Net deferred income tax assets |
|
8,925
|
8,021
|
|
| Net deferred income taxes liabilities |
|
6,282
|
6,736
|
|
| Accumulated deferred income taxes – assets |
|
(276)
|
(106)
|
|
| Accumulated deferred income taxes – liabilities |
|
6,558
|
6,842
|
|
| Federal tax benefit |
|
(167)
|
62
|
$ (1,184)
|
| Accelerated depreciation |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
8,461
|
9,059
|
|
| Property basis differences |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
1,807
|
1,853
|
|
| Leveraged lease basis differences |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
253
|
251
|
|
| Employee benefit obligations |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
477
|
527
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
1,273
|
1,339
|
|
| Premium on reacquired debt |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
88
|
54
|
|
| Storm damage reserves |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
111
|
89
|
|
| Employee benefit obligations |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
975
|
1,044
|
|
| AROs |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
1,232
|
821
|
|
| AROs |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
1,210
|
370
|
|
| Other |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
593
|
689
|
|
| Federal effect of net state deferred tax liabilities |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
260
|
330
|
|
| Other property basis differences |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
251
|
343
|
|
| ITC and PTC carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
2,730
|
2,414
|
|
| Federal NOL carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
|
518
|
|
| Alternative minimum tax carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
62
|
69
|
|
| Other partnership basis difference |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
162
|
23
|
|
| Other comprehensive losses |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
82
|
84
|
|
| AROs |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
2,442
|
1,191
|
|
| Estimated loss on plants under construction |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
346
|
722
|
|
| Other deferred state tax attributes |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
415
|
330
|
|
| Regulatory liability associated with the Tax Reform Legislation (not subject to normalization) |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
294
|
304
|
|
| Other |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
731
|
538
|
|
| Alabama Power |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
4,584
|
3,914
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
1,622
|
1,154
|
|
| Valuation allowance |
|
0
|
0
|
|
| Net deferred income tax assets |
|
1,622
|
1,154
|
|
| Net deferred income taxes liabilities |
|
2,962
|
2,760
|
|
| Accumulated deferred income taxes – assets |
|
0
|
0
|
|
| Accumulated deferred income taxes – liabilities |
|
2,962
|
2,760
|
|
| Federal tax benefit |
|
(91)
|
(136)
|
(103)
|
| Alabama Power | Accelerated depreciation |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
2,236
|
2,135
|
|
| Alabama Power | Property basis differences |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
865
|
725
|
|
| Alabama Power | Leveraged lease basis differences |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Alabama Power | Employee benefit obligations |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
149
|
162
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
286
|
286
|
|
| Alabama Power | Premium on reacquired debt |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
14
|
16
|
|
| Alabama Power | Storm damage reserves |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Alabama Power | Employee benefit obligations |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
260
|
260
|
|
| Alabama Power | AROs |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
276
|
249
|
|
| Alabama Power | AROs |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
607
|
220
|
|
| Alabama Power | Other |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
177
|
147
|
|
| Alabama Power | Federal effect of net state deferred tax liabilities |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
155
|
143
|
|
| Alabama Power | Other property basis differences |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Alabama Power | ITC and PTC carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
11
|
9
|
|
| Alabama Power | Federal NOL carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
|
0
|
|
| Alabama Power | Alternative minimum tax carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Alabama Power | Other partnership basis difference |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Alabama Power | Other comprehensive losses |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
10
|
10
|
|
| Alabama Power | AROs |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
883
|
469
|
|
| Alabama Power | Estimated loss on plants under construction |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Alabama Power | Other deferred state tax attributes |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Alabama Power | Regulatory liability associated with the Tax Reform Legislation (not subject to normalization) |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
130
|
126
|
|
| Alabama Power | Other |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
147
|
111
|
|
| Georgia Power |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
6,098
|
5,025
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
3,078
|
1,850
|
|
| Valuation allowance |
|
(42)
|
0
|
|
| Net deferred income tax assets |
|
3,036
|
1,850
|
|
| Net deferred income taxes liabilities |
|
3,062
|
3,175
|
|
| Accumulated deferred income taxes – assets |
|
0
|
0
|
|
| Accumulated deferred income taxes – liabilities |
|
3,062
|
3,175
|
|
| Federal tax benefit |
|
(393)
|
(256)
|
(391)
|
| Georgia Power | Accelerated depreciation |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
3,005
|
2,889
|
|
| Georgia Power | Property basis differences |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
633
|
606
|
|
| Georgia Power | Leveraged lease basis differences |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Georgia Power | Employee benefit obligations |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
290
|
287
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
444
|
448
|
|
| Georgia Power | Premium on reacquired debt |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
74
|
34
|
|
| Georgia Power | Storm damage reserves |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
111
|
89
|
|
| Georgia Power | Employee benefit obligations |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
344
|
349
|
|
| Georgia Power | AROs |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
925
|
501
|
|
| Georgia Power | AROs |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
575
|
130
|
|
| Georgia Power | Other |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
141
|
140
|
|
| Georgia Power | Federal effect of net state deferred tax liabilities |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
71
|
85
|
|
| Georgia Power | Other property basis differences |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
61
|
59
|
|
| Georgia Power | ITC and PTC carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
430
|
403
|
|
| Georgia Power | Federal NOL carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
|
0
|
|
| Georgia Power | Alternative minimum tax carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Georgia Power | Other partnership basis difference |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Georgia Power | Other comprehensive losses |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
3
|
4
|
|
| Georgia Power | AROs |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
1,500
|
631
|
|
| Georgia Power | Estimated loss on plants under construction |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
283
|
0
|
|
| Georgia Power | Other deferred state tax attributes |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
19
|
6
|
|
| Georgia Power | Regulatory liability associated with the Tax Reform Legislation (not subject to normalization) |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
127
|
123
|
|
| Georgia Power | Other |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
140
|
91
|
|
| Mississippi Power |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
702
|
699
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
515
|
1,103
|
|
| Valuation allowance |
|
(41)
|
(157)
|
|
| Net deferred income tax assets |
|
474
|
946
|
|
| Net deferred income taxes liabilities |
|
228
|
|
|
| Net deferred income taxes assets |
|
|
(247)
|
|
| Accumulated deferred income taxes – assets |
|
(150)
|
(247)
|
|
| Accumulated deferred income taxes – liabilities |
|
378
|
0
|
|
| Federal tax benefit |
|
567
|
(194)
|
31
|
| Mississippi Power | Accelerated depreciation |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
335
|
303
|
|
| Mississippi Power | Property basis differences |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
162
|
207
|
|
| Mississippi Power | Leveraged lease basis differences |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Mississippi Power | Employee benefit obligations |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
25
|
28
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
62
|
62
|
|
| Mississippi Power | Premium on reacquired debt |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Mississippi Power | Storm damage reserves |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Mississippi Power | Employee benefit obligations |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
45
|
46
|
|
| Mississippi Power | AROs |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
31
|
33
|
|
| Mississippi Power | AROs |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Mississippi Power | Other |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
68
|
73
|
|
| Mississippi Power | Federal effect of net state deferred tax liabilities |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
36
|
9
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Mississippi Power | Other property basis differences |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Mississippi Power | ITC and PTC carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Mississippi Power | Federal NOL carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
|
40
|
|
| Mississippi Power | Alternative minimum tax carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
32
|
32
|
|
| Mississippi Power | Other partnership basis difference |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Mississippi Power | Other comprehensive losses |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Mississippi Power | AROs |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
31
|
33
|
|
| Mississippi Power | Estimated loss on plants under construction |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
63
|
722
|
|
| Mississippi Power | Other deferred state tax attributes |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
251
|
133
|
|
| Mississippi Power | Regulatory liability associated with the Tax Reform Legislation (not subject to normalization) |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
29
|
27
|
|
| Mississippi Power | Other |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
47
|
54
|
|
| Southern Power |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
1,523
|
1,961
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
2,631
|
2,700
|
|
| Valuation allowance |
|
(27)
|
(13)
|
|
| Net deferred income tax assets |
|
2,604
|
2,687
|
|
| Net deferred income taxes assets |
|
(1,081)
|
(726)
|
|
| Accumulated deferred income taxes – assets |
|
(1,186)
|
(925)
|
|
| Accumulated deferred income taxes – liabilities |
|
105
|
199
|
|
| Federal tax benefit |
|
(85)
|
566
|
$ (928)
|
| Southern Power | Accelerated depreciation |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
1,483
|
1,922
|
|
| Southern Power | Property basis differences |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
2
|
|
| Southern Power | Leveraged lease basis differences |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Southern Power | Employee benefit obligations |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
6
|
7
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
7
|
8
|
|
| Southern Power | Premium on reacquired debt |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Southern Power | Storm damage reserves |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Southern Power | Employee benefit obligations |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Southern Power | AROs |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Southern Power | AROs |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Southern Power | Other |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
34
|
30
|
|
| Southern Power | Federal effect of net state deferred tax liabilities |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
22
|
42
|
|
| Southern Power | Other property basis differences |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
172
|
184
|
|
| Southern Power | ITC and PTC carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
2,128
|
2,002
|
|
| Southern Power | Federal NOL carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
|
333
|
|
| Southern Power | Alternative minimum tax carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
21
|
21
|
|
| Southern Power | Other partnership basis difference |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
162
|
23
|
|
| Southern Power | Other comprehensive losses |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
|
1
|
|
| Southern Power | AROs |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Southern Power | Estimated loss on plants under construction |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Southern Power | Other deferred state tax attributes |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
72
|
77
|
|
| Southern Power | Regulatory liability associated with the Tax Reform Legislation (not subject to normalization) |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Southern Power | Other |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
47
|
9
|
|
| Southern Company Gas |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
1,493
|
1,641
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
489
|
563
|
|
| Valuation allowance |
|
(12)
|
(11)
|
|
| Net deferred income tax assets |
|
477
|
552
|
|
| Net deferred income taxes liabilities |
|
1,016
|
1,089
|
|
| Accumulated deferred income taxes – assets |
|
0
|
0
|
|
| Accumulated deferred income taxes – liabilities |
|
1,016
|
1,089
|
|
| Federal tax benefit |
$ 0
|
(334)
|
(103)
|
|
| Southern Company Gas | Accelerated depreciation |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
1,176
|
1,150
|
|
| Southern Company Gas | Property basis differences |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
134
|
204
|
|
| Southern Company Gas | Leveraged lease basis differences |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Southern Company Gas | Employee benefit obligations |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
6
|
4
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
150
|
185
|
|
| Southern Company Gas | Premium on reacquired debt |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Southern Company Gas | Storm damage reserves |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Southern Company Gas | Employee benefit obligations |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
45
|
75
|
|
| Southern Company Gas | AROs |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Southern Company Gas | AROs |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
0
|
0
|
|
| Southern Company Gas | Other |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
132
|
208
|
|
| Southern Company Gas | Federal effect of net state deferred tax liabilities |
|
|
|
|
| Deferred tax liabilities — |
|
|
|
|
| Deferred income tax liabilities |
|
|
0
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
46
|
54
|
|
| Southern Company Gas | Other property basis differences |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Southern Company Gas | ITC and PTC carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Southern Company Gas | Federal NOL carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
|
92
|
|
| Southern Company Gas | Alternative minimum tax carryforward |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Southern Company Gas | Other partnership basis difference |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Southern Company Gas | Other comprehensive losses |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Southern Company Gas | AROs |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Southern Company Gas | Estimated loss on plants under construction |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Southern Company Gas | Other deferred state tax attributes |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
0
|
0
|
|
| Southern Company Gas | Regulatory liability associated with the Tax Reform Legislation (not subject to normalization) |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
8
|
9
|
|
| Southern Company Gas | Other |
|
|
|
|
| Deferred tax assets — |
|
|
|
|
| Deferred income tax assets |
|
$ 285
|
$ 223
|
|