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Equity (Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Realized investment gains (losses), net [1] $ (3,615) [2] $ (4,507) [3],[4] $ 2,115 [3],[4]
Other Income [1] $ 4,065 $ 608 [3] $ 2,964 [3]
Amortization of defined benefit items:      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax
Total Foreign Currency Translation Adjustment      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Amounts reclassified from AOCI $ 18 $ (15) $ 65
Net Unrealized Investment Gains (Losses)      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Amounts reclassified from AOCI (1,143) (586) 2,486
Total amortization of defined benefit pension items      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Amounts reclassified from AOCI (71) (157) (264)
Accumulated Other Comprehensive Income (Loss)      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Amounts reclassified from AOCI (1,196) (758) 2,287
Amounts reclassified from AOCI      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Realized investment gains (losses), net 18 (15) 2
Other Income 0 0 63
Amortization of defined benefit items:      
Prior service cost 8 9 (3)
Actuarial gain (loss) (79) (166) (261)
Amounts reclassified from AOCI | Total Foreign Currency Translation Adjustment      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Amounts reclassified from AOCI 18 (15) 65
Amounts reclassified from AOCI | Net Unrealized Investment Gains (Losses)      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Amounts reclassified from AOCI (1,143) (586) 2,486
Amounts reclassified from AOCI | Total amortization of defined benefit pension items      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Amounts reclassified from AOCI (71) (157) (264)
Amounts reclassified from AOCI | Accumulated Other Comprehensive Income (Loss)      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Amounts reclassified from AOCI (1,196) (758) 2,287
Amounts reclassified from AOCI | Net unrealized investment gains (losses) on available-for-sale securities      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Net unrealized investment gains (losses) (1,311) (1,487) 1,939
Amounts reclassified from AOCI | Interest Rate | Cash Flow Hedges      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Net unrealized investment gains (losses) (38) (7) 0
Amounts reclassified from AOCI | Currency | Cash Flow Hedges      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Net unrealized investment gains (losses) 14 15 (4)
Amounts reclassified from AOCI | Currency | Fair value hedges      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Net unrealized investment gains (losses) (8) (4) (6)
Amounts reclassified from AOCI | Currency/Interest Rate | Cash Flow Hedges      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Net unrealized investment gains (losses) $ 200 $ 897 $ 557
[1] See Note 24 for additional information regarding related party transactions.
[2] See Note 24 for additional information regarding related party transactions.
[3] Prior period amounts adjusted for the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.
[4] Prior period amounts adjusted for the adoption of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.