Pension And Other Postretirement Benefits (Summary Of Assets In Excess Of/(Less Than) Benefit Obligation) (Details) - USD ($) $ in Millions |
Dec. 31, 2015 |
Dec. 31, 2014 |
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|---|---|---|---|---|---|
| Pension Benefits - U.S. [Member] | |||||
| Defined Benefit Plan Disclosure [Line Items] | |||||
| Defined benefit plan funded status of plan | $ (5,782) | $ (4,590) | |||
| Unfunded plans | (2,816) | (3,024) | |||
| Total | [1] | (8,598) | (7,614) | ||
| Pension Benefits - Non-U.S. [Member] | |||||
| Defined Benefit Plan Disclosure [Line Items] | |||||
| Defined benefit plan funded status of plan | (588) | (2,113) | |||
| Unfunded plans | (6,112) | (7,839) | |||
| Total | [1] | $ (6,700) | $ (9,952) | ||
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