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Pension and Other Employee Benefits (Pension Benefits Expected to be Paid from Plans or Companies Assets) (Details) (USD $)
In Millions, unless otherwise specified
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Dec. 31, 2012
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Defined Pension Benefits [Member]
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| Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months |
$ 1,419 |
| Defined Benefit Plan, Expected Future Benefit Payments, Year Two |
1,469 |
| Defined Benefit Plan, Expected Future Benefit Payments, Year Three |
1,514 |
| Defined Benefit Plan, Expected Future Benefit Payments, Year Four |
1,511 |
| Defined Benefit Plan, Expected Future Benefit Payments, Year Five |
1,504 |
| Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter |
7,824 |
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Other Benefits [Member]
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| Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months |
56 |
| Defined Benefit Plan, Expected Future Benefit Payments, Year Two |
57 |
| Defined Benefit Plan, Expected Future Benefit Payments, Year Three |
57 |
| Defined Benefit Plan, Expected Future Benefit Payments, Year Four |
57 |
| Defined Benefit Plan, Expected Future Benefit Payments, Year Five |
57 |
| Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter |
$ 279 |