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Equity (Components of Other Comprehensive Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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 |  | $ 43 | $ 113 | $ (148)
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax |  | 3 | (10) | (1)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax |  | 46 | 103 | (149)
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap, Before Reclassification and Tax |  | (29) | (33) | 87
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap Tax |  | 6 | 7 | (18)
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap Net Of Tax |  | (23) | (26) | 69
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax |  | 14 | 80 | (61)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |  | 9 | (3) | (19)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax |  | 23 | 77 | (80)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax | [1] | 2,812 | 3,208 | (1,834)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax | [1] | (614) | (698) | 394
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax | [1] | 2,198 | 2,510 | (1,440)
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax | [1] | (8) | 84 | (122)
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Tax | [1] | (1) | (17) | 26
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax | [1] | (9) | 67 | (96)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments and Tax | [1] | 2,820 | 3,124 | (1,712)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax | [1] | (613) | (681) | 368
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax | [1] | 2,207 | 2,443 | (1,344)
Other than Temporary Impairment Loss, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent, Available-for-sale Securities |  | (8) | 0 | 0
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Tax, Portion Attributable to Parent, Available-for-sale Securities |  | 2 | 0 | 0
Change in other-than-temporary impairment losses on fixed maturity securities |  | (6) | 0 | 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax |  | (1) | (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 |  | (1) | (1) | (1)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  | (2) | (23) | 1
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax |  | 1 | 5 | 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax |  | (1) | (18) | 1
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax |  | (3) | (24) | 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  | 1 | 5 | 0
Defined benefit pension and postretirement plan adjustments |  | (2) | (19) | 0
Other Comprehensive Income (Loss), before Tax |  | 2,823 | 3,180 | (1,773)
Other Comprehensive Income (Loss), Tax |  | (601) | (679) | 349
Other Comprehensive Income (Loss), Net of Tax |  | $ 2,222 | $ 2,501 | $ (1,424)
[1] | Includes cash flow hedges. See Note 5 for additional information on cash flow hedges.

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