Pension And Other Postretirement Benefits (Summary Of Assets In Excess Of/(Less Than) Benefit Obligation) (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
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|---|---|---|---|---|
| U.S. [Member] | ||||
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Defined benefit plan funded status of plan | $ (4,656) | $ (4,604) | ||
| Unfunded plans | (2,667) | (2,436) | ||
| Total | [1] | (7,323) | (7,040) | |
| Pension Benefits - Non-U.S. [Member] | ||||
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Defined benefit plan funded status of plan | (1,728) | 439 | ||
| Unfunded plans | (5,274) | (6,331) | ||
| Total | [1] | $ (7,002) | $ (5,892) | |
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