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Equity (Components of Other Comprehensive Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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 |  | $ 224 | $ (131) | $ 81
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax |  | (26) | (22) | (23)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax |  | 198 | (153) | 58
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap, Before Reclassification and Tax |  | (18) | 64 | (2)
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap Tax |  | 4 | (13) | 0
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap Net Of Tax |  | (14) | 51 | (2)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax |  | 206 | (67) | 79
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |  | (22) | (35) | (23)
Foreign currency translation adjustments |  | 184 | (102) | 56
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax | [1] | 2,050 | (12,036) | (2,137)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax | [1] | (401) | 2,582 | 481
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax | [1] | 1,649 | (9,454) | (1,656)
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax | [1] | (228) | (218) | 226
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Tax | [1] | 48 | 40 | (49)
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax | [1] | (180) | (178) | 177
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments and Tax | [1] | 2,278 | (11,818) | (2,363)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax | [1] | (449) | 2,542 | 530
Net unrealized investment gains (losses) | [1] | 1,829 | (9,276) | (1,833)
Other than Temporary Impairment Loss, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent, Available-for-sale Securities |  | 0 | 0 | 0
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Tax, Portion Attributable to Parent, Available-for-sale Securities |  | 0 | 0 | 0
Change in instrument-specific credit risk for market risk benefits |  | 0 | 0 | 0
OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment, Tax |  | 161 | (2,224) | (580)
OCI, Liability for Future Policy Benefit, Gain (Loss), before Reclassification Adjustment and Tax |  | (660) | 10,188 | 2,787
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax |  | (1) | (3) | 2
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax |  | 1 | 1 | 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax |  | 0 | (2) | 2
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  | (3) | 33 | 27
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax |  | 1 | (8) | (7)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax |  | (2) | 25 | 20
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax |  | (4) | 30 | 29
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  | 2 | (7) | (7)
Defined benefit pension and postretirement plan adjustments |  | (2) | 23 | 22
Other Comprehensive Income (Loss), before Tax |  | 1,807 | (1,642) | 478
Other Comprehensive Income (Loss), Tax |  | (305) | 271 | (69)
Other Comprehensive Income (Loss), Net of Tax |  | 1,502 | (1,371) | 409
Effect of updating discount rates on future policy benefits |  | (499) | 7,964 | 2,207
OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), before Adjustments and Tax |  | (13) | 25 | (54)
Change in instrument-specific credit risk for market risk benefits |  | (10) | 20 | (43)
OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), after Adjustments, Tax |  | $ 3 | $ (5) | $ 11
[1] | Includes cash flow hedges. See Note 12 for additional information on cash flow hedges.

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Data Type: | xbrli:monetaryItemType
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Period Type: | duration