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Accumulated Other Comprehensive Income (Loss) Reclassifications in AOCI (Details) - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | $ 0 | $ 0 | $ 11
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Settlement gain | 0 | 0 | 14
Provision for (benefit from) income taxes | $ 0 | $ 0 | $ (3)

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