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Derivatives (Primary Risks) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount $ 275,407   $ 265,548
Estimated Fair Value Assets 8,602   8,212
Estimated Fair Value Liabilities 6,802   7,259
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net 12 $ (10)  
Accumulated Other Comprehensive Income Loss 212   357
Cash Flow Hedges [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 0 0  
Cash Flow Hedges [Member] | Foreign currency swaps      
Derivatives, Fair Value [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 0 0  
Cash Flow Hedges [Member] | Interest rate contracts      
Derivatives, Fair Value [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 0 0  
Not Designated as Hedging Instrument, Economic Hedge | Derivative Contract [Domain]      
Derivatives, Fair Value [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 65 (295)  
Derivatives Designated as Hedging Instruments:      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 67,582   66,279
Estimated Fair Value Assets 4,550   4,543
Estimated Fair Value Liabilities 3,687   3,890
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 6,712   6,792
Estimated Fair Value Assets 1,013   1,051
Estimated Fair Value Liabilities 705   774
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member] | Interest rate swaps      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 5,108   5,188
Estimated Fair Value Assets 990   1,018
Estimated Fair Value Liabilities 636   666
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member] | Foreign currency swaps      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 1,454   1,454
Estimated Fair Value Assets 23   33
Estimated Fair Value Liabilities 31   67
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member] | Foreign currency forwards      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 150   150
Estimated Fair Value Assets 0   0
Estimated Fair Value Liabilities 38   41
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 56,784   54,934
Estimated Fair Value Assets 3,011   2,914
Estimated Fair Value Liabilities 2,971   3,116
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member] | Interest rate swaps      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 4,135   4,154
Estimated Fair Value Assets 13   0
Estimated Fair Value Liabilities 321   359
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member] | Interest rate forwards      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 5,474   4,901
Estimated Fair Value Assets 85   56
Estimated Fair Value Liabilities 908   880
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member] | Foreign currency swaps      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 47,175   45,879
Estimated Fair Value Assets 2,913   2,858
Estimated Fair Value Liabilities 1,742   1,877
Derivatives Designated as Hedging Instruments: | Foreign Operations Hedges [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 4,086   4,553
Estimated Fair Value Assets 526   578
Estimated Fair Value Liabilities 11   0
Derivatives Designated as Hedging Instruments: | Foreign Operations Hedges [Member] | Foreign currency forwards      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 1,086   1,553
Estimated Fair Value Assets 4   42
Estimated Fair Value Liabilities 11   0
Derivatives Designated as Hedging Instruments: | Foreign Operations Hedges [Member] | Currency options      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 3,000   3,000
Estimated Fair Value Assets 522   536
Estimated Fair Value Liabilities 0   0
Derivatives Not Designated or Not Qualifying as Hedging Instruments:      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 207,825   199,269
Estimated Fair Value Assets 4,052   3,669
Estimated Fair Value Liabilities 3,115   3,369
Derivative, Gain (Loss) on Derivative, Net 335 $ (1,211)  
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate swaps      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 30,504   29,238
Estimated Fair Value Assets 1,575   1,414
Estimated Fair Value Liabilities 1,326   1,263
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate forwards      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 3,261   3,128
Estimated Fair Value Assets 202   135
Estimated Fair Value Liabilities 76   77
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate floors      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 6,040   6,169
Estimated Fair Value Assets 71   38
Estimated Fair Value Liabilities 0   0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate caps      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 16,648   17,998
Estimated Fair Value Assets 86   133
Estimated Fair Value Liabilities 0   1
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate futures      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 2,229   1,667
Estimated Fair Value Assets 3   1
Estimated Fair Value Liabilities 12   1
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate options      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 34,581   34,939
Estimated Fair Value Assets 181   210
Estimated Fair Value Liabilities 137   217
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Synthetic GICs      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 53,796   49,599
Estimated Fair Value Assets 0   0
Estimated Fair Value Liabilities 0   0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Foreign currency swaps      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 10,684   10,708
Estimated Fair Value Assets 1,096   1,192
Estimated Fair Value Liabilities 185   190
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Foreign currency forwards      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 16,192   13,471
Estimated Fair Value Assets 174   47
Estimated Fair Value Liabilities 1,051   1,277
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Currency futures      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 308   301
Estimated Fair Value Assets 2   1
Estimated Fair Value Liabilities 0   0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Credit default swaps — purchased      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 2,771   2,791
Estimated Fair Value Assets 8   14
Estimated Fair Value Liabilities 68   67
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Credit default swaps — written      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 12,096   11,764
Estimated Fair Value Assets 204   201
Estimated Fair Value Liabilities 3   5
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity futures      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 1,811   1,840
Estimated Fair Value Assets 37   9
Estimated Fair Value Liabilities 2   6
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity index options      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 13,991   12,743
Estimated Fair Value Assets 306   233
Estimated Fair Value Liabilities 232   253
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity variance swaps      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 114   114
Estimated Fair Value Assets 0   0
Estimated Fair Value Liabilities 3   3
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity total return swaps      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 1,799   1,799
Estimated Fair Value Assets 107   41
Estimated Fair Value Liabilities 20   9
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Longevity Swaps      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 1,000   1,000
Derivative Liability, Not Subject to Master Netting Arrangement 0   0
Derivative Asset, Not Subject to Master Netting Arrangement 0   0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Derivatives hedging MRBs      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 13,595   13,585
Estimated Fair Value Assets 187   143
Estimated Fair Value Liabilities 848   883
Not Designated as Hedging Instrument, Economic Hedge | Interest rate contracts      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 8,964   8,913
Estimated Fair Value Assets 14   11
Estimated Fair Value Liabilities 727   768
Not Designated as Hedging Instrument, Economic Hedge | Foreign currency exchange rate      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 409   378
Estimated Fair Value Assets 6   0
Estimated Fair Value Liabilities 1   2
Not Designated as Hedging Instrument, Economic Hedge | Equity      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 4,222   4,294
Estimated Fair Value Assets 167   132
Estimated Fair Value Liabilities $ 120   $ 113