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Other Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance, beginning of period | $ 9,260 |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (127) | $ (821)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 40 | 29
Other comprehensive loss, net of tax | (87) | (792)
Balance, end of period | 9,596 | 7,451
AOCI Attributable to Parent |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance, beginning of period | (5,110) | (5,055)
Other comprehensive loss, net of tax | (87) | (792)
Balance, end of period | (5,197) | (5,847)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance, beginning of period | (4,126) | (3,512)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (36) | 109
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 40 | 29
Other comprehensive loss, net of tax | 4 | 138
Balance, end of period | (4,122) | (3,374)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance, beginning of period | (984) | (1,543)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (91) | (930)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0
Other comprehensive loss, net of tax | (91) | (930)
Balance, end of period | $ (1,075) | $ (2,473)

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