|
Employee Benefits, Changes in Fair Value in Pension Plan And Other Benefit Plan Assets Measured at Fair Value (Details) (USD $)
In Millions, unless otherwise specified
|
12 Months Ended |
|
Dec. 31, 2012
|
Dec. 31, 2011
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at end of year |
$ 9,490 |
$ 9,061 |
|
Pension plan assets [Member]
|
|
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at end of year |
9,539 |
9,061 |
|
Pension plan assets [Member] | Level 3 [Member]
|
|
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at beginning of year |
792 |
847 |
| Gross Realized Gain (Loss) |
32 |
20 |
| Gross Unrealized Gain (Loss) |
17 |
34 |
| Purchases, sales, and settlements, net |
(46) |
(109) |
| Transfers into/(out of) Level 3 |
(201) |
0 |
| Fair value of plan assets at end of year |
594 |
792 |
|
Other benefits plan assets [Member]
|
|
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at end of year |
636 |
640 |
|
Other benefits plan assets [Member] | Level 3 [Member]
|
|
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at beginning of year |
47 |
48 |
| Gross Realized Gain (Loss) |
0 |
0 |
| Gross Unrealized Gain (Loss) |
0 |
0 |
| Purchases, sales, and settlements, net |
(25) |
(1) |
| Transfers into/(out of) Level 3 |
0 |
0 |
| Fair value of plan assets at end of year |
22 |
47 |
|
Long duration fixed income [Member] | Pension plan assets [Member] | Level 3 [Member]
|
|
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at beginning of year |
1 |
0 |
| Gross Realized Gain (Loss) |
0 |
0 |
| Gross Unrealized Gain (Loss) |
0 |
0 |
| Purchases, sales, and settlements, net |
0 |
1 |
| Transfers into/(out of) Level 3 |
0 |
0 |
| Fair value of plan assets at end of year |
1 |
1 |
|
Intermediate (core) fixed income [Member] | Pension plan assets [Member] | Level 3 [Member]
|
|
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at beginning of year |
6 |
10 |
| Gross Realized Gain (Loss) |
0 |
0 |
| Gross Unrealized Gain (Loss) |
0 |
1 |
| Purchases, sales, and settlements, net |
0 |
(5) |
| Transfers into/(out of) Level 3 |
(6) |
0 |
| Fair value of plan assets at end of year |
0 |
6 |
|
High-yield fixed income [Member] | Pension plan assets [Member] | Level 3 [Member]
|
|
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at beginning of year |
1 |
1 |
| Gross Realized Gain (Loss) |
0 |
0 |
| Gross Unrealized Gain (Loss) |
0 |
0 |
| Purchases, sales, and settlements, net |
0 |
0 |
| Transfers into/(out of) Level 3 |
(1) |
0 |
| Fair value of plan assets at end of year |
0 |
1 |
|
Domestic large-cap stocks [Member] | Pension plan assets [Member] | Level 3 [Member]
|
|
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at beginning of year |
2 |
4 |
| Gross Realized Gain (Loss) |
0 |
0 |
| Gross Unrealized Gain (Loss) |
0 |
(1) |
| Purchases, sales, and settlements, net |
0 |
(1) |
| Transfers into/(out of) Level 3 |
(2) |
0 |
| Fair value of plan assets at end of year |
0 |
2 |
|
International stocks [Member] | Pension plan assets [Member] | Level 3 [Member]
|
|
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at beginning of year |
1 |
6 |
| Gross Realized Gain (Loss) |
0 |
0 |
| Gross Unrealized Gain (Loss) |
0 |
(1) |
| Purchases, sales, and settlements, net |
1 |
(4) |
| Transfers into/(out of) Level 3 |
(1) |
0 |
| Fair value of plan assets at end of year |
1 |
1 |
|
Real estate/timber [Member] | Pension plan assets [Member] | Level 3 [Member]
|
|
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at beginning of year |
355 |
360 |
| Gross Realized Gain (Loss) |
22 |
10 |
| Gross Unrealized Gain (Loss) |
2 |
22 |
| Purchases, sales, and settlements, net |
(51) |
(37) |
| Transfers into/(out of) Level 3 |
0 |
0 |
| Fair value of plan assets at end of year |
328 |
355 |
|
Real estate/timber [Member] | Other benefits plan assets [Member] | Level 3 [Member]
|
|
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at beginning of year |
12 |
12 |
| Gross Realized Gain (Loss) |
0 |
0 |
| Gross Unrealized Gain (Loss) |
0 |
0 |
| Purchases, sales, and settlements, net |
(12) |
0 |
| Transfers into/(out of) Level 3 |
0 |
0 |
| Fair value of plan assets at end of year |
0 |
12 |
|
Multi-strategy hedge funds [Member] | Pension plan assets [Member] | Level 3 [Member]
|
|
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at beginning of year |
251 |
313 |
| Gross Realized Gain (Loss) |
1 |
5 |
| Gross Unrealized Gain (Loss) |
2 |
(3) |
| Purchases, sales, and settlements, net |
8 |
(64) |
| Transfers into/(out of) Level 3 |
(191) |
0 |
| Fair value of plan assets at end of year |
71 |
251 |
|
Multi-strategy hedge funds [Member] | Other benefits plan assets [Member] | Level 3 [Member]
|
|
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at beginning of year |
8 |
10 |
| Gross Realized Gain (Loss) |
0 |
0 |
| Gross Unrealized Gain (Loss) |
0 |
0 |
| Purchases, sales, and settlements, net |
(8) |
(2) |
| Transfers into/(out of) Level 3 |
0 |
0 |
| Fair value of plan assets at end of year |
0 |
8 |
|
Private Equity Funds [Member] | Pension plan assets [Member] | Level 3 [Member]
|
|
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at beginning of year |
129 |
112 |
| Gross Realized Gain (Loss) |
8 |
1 |
| Gross Unrealized Gain (Loss) |
10 |
16 |
| Purchases, sales, and settlements, net |
(2) |
0 |
| Transfers into/(out of) Level 3 |
0 |
0 |
| Fair value of plan assets at end of year |
145 |
129 |
|
Private Equity Funds [Member] | Other benefits plan assets [Member] | Level 3 [Member]
|
|
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at beginning of year |
4 |
4 |
| Gross Realized Gain (Loss) |
0 |
0 |
| Gross Unrealized Gain (Loss) |
0 |
0 |
| Purchases, sales, and settlements, net |
(4) |
0 |
| Transfers into/(out of) Level 3 |
0 |
0 |
| Fair value of plan assets at end of year |
0 |
4 |
|
Other Plan Assets [Member] | Pension plan assets [Member] | Level 3 [Member]
|
|
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at beginning of year |
46 |
41 |
| Gross Realized Gain (Loss) |
1 |
4 |
| Gross Unrealized Gain (Loss) |
3 |
0 |
| Purchases, sales, and settlements, net |
(2) |
1 |
| Transfers into/(out of) Level 3 |
0 |
0 |
| Fair value of plan assets at end of year |
48 |
46 |
|
Other Plan Assets [Member] | Other benefits plan assets [Member] | Level 3 [Member]
|
|
|
| Changes in Level 3 pension plan assets measured at fair value [Abstract] |
|
|
| Fair value of plan assets at beginning of year |
23 |
22 |
| Gross Realized Gain (Loss) |
0 |
0 |
| Gross Unrealized Gain (Loss) |
0 |
0 |
| Purchases, sales, and settlements, net |
(1) |
1 |
| Transfers into/(out of) Level 3 |
0 |
0 |
| Fair value of plan assets at end of year |
$ 22 |
$ 23 |