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Equity (Components of Other Comprehensive Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax |  | $ 85 | $ 43 | $ 113
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax |  | (24) | 3 | (10)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax |  | 61 | 46 | 103
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap, Before Reclassification and Tax |  | (2) | (29) | (33)
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap Tax |  | 1 | 6 | 7
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap Net Of Tax |  | (1) | (23) | (26)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax |  | 83 | 14 | 80
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |  | (23) | 9 | (3)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax |  | 60 | 23 | 77
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax | [1] | (2,093) | 2,812 | 3,208
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax | [1] | 471 | (614) | (698)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax | [1] | (1,622) | 2,198 | 2,510
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax | [1] | 226 | (8) | 84
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Tax | [1] | (49) | (1) | (17)
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax | [1] | 177 | (9) | 67
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments and Tax | [1] | (2,319) | 2,820 | 3,124
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax | [1] | 520 | (613) | (681)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax | [1] | (1,799) | 2,207 | 2,443
Other than Temporary Impairment Loss, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent, Available-for-sale Securities |  | 0 | (8) | 0
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Tax, Portion Attributable to Parent, Available-for-sale Securities |  | 0 | 2 | 0
Change in other-than-temporary impairment losses on fixed maturity securities |  | 0 | (6) | 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax |  | 2 | (1) | (1)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax |  | 0 | 0 | 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax |  | 2 | (1) | (1)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  | 27 | (2) | (23)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax |  | (7) | 1 | 5
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax |  | 20 | (1) | (18)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax |  | 29 | (3) | (24)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  | (7) | 1 | 5
Defined benefit pension and postretirement plan adjustments |  | 22 | (2) | (19)
Other Comprehensive Income (Loss), before Tax |  | (2,207) | 2,823 | 3,180
Other Comprehensive Income (Loss), Tax |  | 490 | (601) | (679)
Other Comprehensive Income (Loss), Net of Tax |  | $ (1,717) | $ 2,222 | $ 2,501
[1] | Includes cash flow hedges. See Note 5 for additional information on cash flow hedges.

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