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Benefit Obligations (Schedule of Net Periodic Benefit Costs Recognized) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Pension Benefits [Member]
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| Defined Benefit Plan Disclosure [Line Items] | ||||
| Service cost | $ 3 | $ 9 | $ 9 | $ 26 |
| Interest cost | 41 | 39 | 126 | 116 |
| Expected return on plan assets | (54) | (57) | (162) | (169) |
| Amortization of prior service cost (credit), net | 0 | 0 | 0 | 1 |
| Total | (10) | (9) | (27) | (26) |
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Postretirement Benefits [Member]
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| Defined Benefit Plan Disclosure [Line Items] | ||||
| Service cost | 0 | 0 | 1 | 2 |
| Interest cost | 1 | 3 | 3 | 8 |
| Expected return on plan assets | 0 | 0 | 0 | 0 |
| Amortization of prior service cost (credit), net | (21) | 0 | (62) | 0 |
| Total | $ (20) | $ 3 | $ (58) | $ 10 |