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Pension Plans and Postretirement Benefits (Benefit Obligation and Expense for Our Split-Dollar Life Insurance Agreements) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
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|
| Postretirement and Pension Plans | |||
| Benefit obligation | $ 217 | $ 212 | $ 202 |
| Other operating and administrative expenses | $ 52 | $ 50 | $ 58 |