|
Pension and Other Employee Benefits (Schedule of Components of Net Periodic Benefit Cost) (Details) (USD $)
In Millions, unless otherwise specified
|
12 Months Ended |
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2010
|
|
Defined Pension Benefits [Member]
|
|
|
|
| Service cost |
$ 516 |
$ 471 |
$ 442 |
| Interest cost |
1,047 |
1,069 |
1,058 |
| Expected return on plan assets |
(1,422) |
(1,272) |
(1,215) |
| Amounts reflected in net funded status |
141 |
268 |
285 |
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit) |
10 |
11 |
13 |
| Recognized net actuarial loss |
939 |
792 |
596 |
| Loss due to curtailments/settlements |
3 |
2 |
2 |
| Amounts reclassified during the year |
952 |
805 |
611 |
| Net periodic cost (credit) |
1,093 |
1,073 |
896 |
|
Other Benefits [Member]
|
|
|
|
| Service cost |
8 |
9 |
9 |
| Interest cost |
38 |
41 |
48 |
| Expected return on plan assets |
(31) |
(34) |
(32) |
| Amounts reflected in net funded status |
15 |
16 |
25 |
| Amortization Of Transition Obligation |
1 |
4 |
4 |
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit) |
(3) |
(10) |
(45) |
| Recognized net actuarial loss |
3 |
3 |
5 |
| Amounts reclassified during the year |
1 |
(3) |
(36) |
| Net periodic cost (credit) |
$ 16 |
$ 13 |
$ (11) |