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Derivatives (Primary Risks) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount $ 262,971   $ 262,971   $ 265,548
Estimated Fair Value Assets 7,347   7,347   8,212
Estimated Fair Value Liabilities 7,364   7,364   7,259
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net 2 $ 10 16 $ 4  
Accumulated Other Comprehensive Income Loss (1,600)   (1,600)   357
Cash Flow Hedges [Member]          
Derivatives, Fair Value [Line Items]          
Derivative, Gain (Loss) on Derivative, Net 0 0 0 0  
Cash Flow Hedges [Member] | Foreign currency swaps          
Derivatives, Fair Value [Line Items]          
Derivative, Gain (Loss) on Derivative, Net 0 0 0 0  
Cash Flow Hedges [Member] | Interest rate contracts          
Derivatives, Fair Value [Line Items]          
Derivative, Gain (Loss) on Derivative, Net 0 0 0 0  
Not Designated as Hedging Instrument, Economic Hedge | Derivative Contract [Domain]          
Derivatives, Fair Value [Line Items]          
Derivative, Gain (Loss) on Derivative, Net     (329) (395)  
Derivatives Designated as Hedging Instruments:          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 66,020   66,020   66,279
Estimated Fair Value Assets 3,754   3,754   4,543
Estimated Fair Value Liabilities 4,192   4,192   3,890
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member]          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 6,264   6,264   6,792
Estimated Fair Value Assets 967   967   1,051
Estimated Fair Value Liabilities 714   714   774
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member] | Interest rate swaps          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 5,143   5,143   5,188
Estimated Fair Value Assets 933   933   1,018
Estimated Fair Value Liabilities 661   661   666
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member] | Foreign currency swaps          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 971   971   1,454
Estimated Fair Value Assets 34   34   33
Estimated Fair Value Liabilities 13   13   67
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member] | Foreign currency forwards          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 150   150   150
Estimated Fair Value Assets 0   0   0
Estimated Fair Value Liabilities 40   40   41
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member]          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 55,840   55,840   54,934
Estimated Fair Value Assets 2,607   2,607   2,914
Estimated Fair Value Liabilities 3,458   3,458   3,116
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member] | Interest rate swaps          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 4,195   4,195   4,154
Estimated Fair Value Assets 0   0   0
Estimated Fair Value Liabilities 295   295   359
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member] | Interest rate forwards          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 4,638   4,638   4,901
Estimated Fair Value Assets 45   45   56
Estimated Fair Value Liabilities 1,086   1,086   880
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member] | Foreign currency swaps          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 47,007   47,007   45,879
Estimated Fair Value Assets 2,562   2,562   2,858
Estimated Fair Value Liabilities 2,077   2,077   1,877
Derivatives Designated as Hedging Instruments: | Foreign Operations Hedges [Member]          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 3,916   3,916   4,553
Estimated Fair Value Assets 180   180   578
Estimated Fair Value Liabilities 20   20   0
Derivatives Designated as Hedging Instruments: | Foreign Operations Hedges [Member] | Foreign currency forwards          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 916   916   1,553
Estimated Fair Value Assets 8   8   42
Estimated Fair Value Liabilities 20   20   0
Derivatives Designated as Hedging Instruments: | Foreign Operations Hedges [Member] | Currency options          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 3,000   3,000   3,000
Estimated Fair Value Assets 172   172   536
Estimated Fair Value Liabilities 0   0   0
Derivatives Not Designated or Not Qualifying as Hedging Instruments:          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 196,951   196,951   199,269
Estimated Fair Value Assets 3,593   3,593   3,669
Estimated Fair Value Liabilities 3,172   3,172   3,369
Derivative, Gain (Loss) on Derivative, Net (793) $ 673 (1,357) $ (1,253)  
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate swaps          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 26,917   26,917   29,238
Estimated Fair Value Assets 1,653   1,653   1,414
Estimated Fair Value Liabilities 1,423   1,423   1,263
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate forwards          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 3,141   3,141   3,128
Estimated Fair Value Assets 112   112   135
Estimated Fair Value Liabilities 111   111   77
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate floors          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 5,640   5,640   6,169
Estimated Fair Value Assets 43   43   38
Estimated Fair Value Liabilities 0   0   0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate caps          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 16,648   16,648   17,998
Estimated Fair Value Assets 40   40   133
Estimated Fair Value Liabilities 2   2   1
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate futures          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 2,748   2,748   1,667
Estimated Fair Value Assets 0   0   1
Estimated Fair Value Liabilities 5   5   1
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate options          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 32,589   32,589   34,939
Estimated Fair Value Assets 159   159   210
Estimated Fair Value Liabilities 121   121   217
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Synthetic GICs          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 51,920   51,920   49,599
Estimated Fair Value Assets 0   0   0
Estimated Fair Value Liabilities 0   0   0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Foreign currency swaps          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 11,148   11,148   10,708
Estimated Fair Value Assets 1,008   1,008   1,192
Estimated Fair Value Liabilities 244   244   190
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Foreign currency forwards          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 14,631   14,631   13,471
Estimated Fair Value Assets 50   50   47
Estimated Fair Value Liabilities 778   778   1,277
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Currency futures          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 308   308   301
Estimated Fair Value Assets 4   4   1
Estimated Fair Value Liabilities 0   0   0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Credit default swaps — purchased          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 2,763   2,763   2,791
Estimated Fair Value Assets 2   2   14
Estimated Fair Value Liabilities 66   66   67
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Credit default swaps — written          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 11,983   11,983   11,764
Estimated Fair Value Assets 234   234   201
Estimated Fair Value Liabilities 2   2   5
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity futures          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 1,888   1,888   1,840
Estimated Fair Value Assets 12   12   9
Estimated Fair Value Liabilities 12   12   6
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity index options          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 11,462   11,462   12,743
Estimated Fair Value Assets 276   276   233
Estimated Fair Value Liabilities 292   292   253
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity variance swaps          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 121   121   114
Estimated Fair Value Assets 0   0   0
Estimated Fair Value Liabilities 3   3   3
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity total return swaps          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 2,044   2,044   1,799
Estimated Fair Value Assets 0   0   41
Estimated Fair Value Liabilities 113   113   9
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Longevity Swaps          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 1,000   1,000   1,000
Derivative Liability, Not Subject to Master Netting Arrangement 0   0   0
Derivative Asset, Not Subject to Master Netting Arrangement 0   0   0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Derivatives hedging MRBs          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 13,781   13,781   13,585
Estimated Fair Value Assets 266   266   143
Estimated Fair Value Liabilities 975   975   883
Not Designated as Hedging Instrument, Economic Hedge | Interest rate contracts          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 9,206   9,206   8,913
Estimated Fair Value Assets 118   118   11
Estimated Fair Value Liabilities 759   759   768
Not Designated as Hedging Instrument, Economic Hedge | Foreign currency exchange rate          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 416   416   378
Estimated Fair Value Assets 0   0   0
Estimated Fair Value Liabilities 5   5   2
Not Designated as Hedging Instrument, Economic Hedge | Equity          
Derivatives, Fair Value [Line Items]          
Derivative, Notional Amount 4,159   4,159   4,294
Estimated Fair Value Assets 148   148   132
Estimated Fair Value Liabilities $ 211   $ 211   $ 113