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Derivatives (Primary Risks) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 328,116 | $ 308,215
Estimated Fair Value Assets | 11,411 | 10,466
Estimated Fair Value Liabilities | 6,975 | 3,852
Derivatives Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 63,923 | 61,088
Estimated Fair Value Assets | 5,244 | 4,009
Estimated Fair Value Liabilities | 3,909 | 1,764
Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedges [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 6,081 | 5,987
Estimated Fair Value Assets | 1,445 | 2,175
Estimated Fair Value Liabilities | 556 | 87
Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedges [Member] | Interest rate swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 4,143 | 3,550
Estimated Fair Value Assets | 1,353 | 2,164
Estimated Fair Value Liabilities | 467 | 6
Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedges [Member] | Foreign currency swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 602 | 801
Estimated Fair Value Assets | 82 | 11
Estimated Fair Value Liabilities | 0 | 23
Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedges [Member] | Foreign currency forwards |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,336 | 1,636
Estimated Fair Value Assets | 10 | 0
Estimated Fair Value Liabilities | 89 | 58
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedges [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 54,162 | 52,101
Estimated Fair Value Assets | 3,563 | 1,695
Estimated Fair Value Liabilities | 3,315 | 1,677
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedges [Member] | Interest rate swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 4,107 | 4,117
Estimated Fair Value Assets | 8 | 6
Estimated Fair Value Liabilities | 262 | 1
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedges [Member] | Interest rate forwards |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 7,447 | 6,889
Estimated Fair Value Assets | 1 | 89
Estimated Fair Value Liabilities | 1,354 | 119
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedges [Member] | Foreign currency swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 42,608 | 41,095
Estimated Fair Value Assets | 3,554 | 1,600
Estimated Fair Value Liabilities | 1,699 | 1,557
Derivatives Designated as Hedging Instruments [Member] | Foreign Operations Hedges [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 3,680 | 3,000
Estimated Fair Value Assets | 236 | 139
Estimated Fair Value Liabilities | 38 | 0
Derivatives Designated as Hedging Instruments [Member] | Foreign Operations Hedges [Member] | Foreign currency forwards |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 680 | 0
Estimated Fair Value Assets | 0 | 0
Estimated Fair Value Liabilities | 38 | 0
Derivatives Designated as Hedging Instruments [Member] | Foreign Operations Hedges [Member] | Currency options |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 3,000 | 3,000
Estimated Fair Value Assets | 236 | 139
Estimated Fair Value Liabilities | 0 | 0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 264,193 | 247,127
Estimated Fair Value Assets | 6,167 | 6,457
Estimated Fair Value Liabilities | 3,066 | 2,088
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 31,661 | 38,860
Estimated Fair Value Assets | 1,660 | 3,644
Estimated Fair Value Liabilities | 1,354 | 115
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate forwards |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 381 | 374
Estimated Fair Value Assets | 0 | 0
Estimated Fair Value Liabilities | 32 | 26
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate floors |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 25,270 | 7,701
Estimated Fair Value Assets | 125 | 145
Estimated Fair Value Liabilities | 0 | 0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate caps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 48,290 | 65,559
Estimated Fair Value Assets | 950 | 124
Estimated Fair Value Liabilities | 0 | 0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate futures |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,453 | 1,615
Estimated Fair Value Assets | 2 | 4
Estimated Fair Value Liabilities | 1 | 0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate options |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 44,391 | 11,754
Estimated Fair Value Assets | 473 | 493
Estimated Fair Value Liabilities | 88 | 10
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Synthetic GICs |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 46,316 | 40,121
Estimated Fair Value Assets | 0 | 0
Estimated Fair Value Liabilities | 0 | 0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Foreign currency swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 12,815 | 12,787
Estimated Fair Value Assets | 1,454 | 768
Estimated Fair Value Liabilities | 383 | 614
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Foreign currency forwards |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 16,195 | 16,230
Estimated Fair Value Assets | 544 | 36
Estimated Fair Value Liabilities | 661 | 666
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Currency futures |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 333 | 839
Estimated Fair Value Assets | 8 | 0
Estimated Fair Value Liabilities | 0 | 2
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Currency options |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 0 | 900
Estimated Fair Value Assets | 0 | 0
Estimated Fair Value Liabilities | 0 | 0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Credit default swaps — purchased |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,925 | 3,042
Estimated Fair Value Assets | 18 | 13
Estimated Fair Value Liabilities | 79 | 113
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Credit default swaps — written |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 11,512 | 8,626
Estimated Fair Value Assets | 133 | 177
Estimated Fair Value Liabilities | 28 | 12
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Equity futures |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,988 | 4,204
Estimated Fair Value Assets | 8 | 12
Estimated Fair Value Liabilities | 4 | 5
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Equity index options |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 16,701 | 29,743
Estimated Fair Value Assets | 765 | 1,004
Estimated Fair Value Liabilities | 323 | 458
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Equity variance swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 163 | 699
Estimated Fair Value Assets | 4 | 17
Estimated Fair Value Liabilities | 1 | 13
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Total rate of return swaps [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 0 | 1,048
Estimated Fair Value Assets | 0 | 9
Estimated Fair Value Liabilities | 0 | 4
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Equity Total Return Swaps [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,799 | 3,025
Estimated Fair Value Assets | 23 | 11
Estimated Fair Value Liabilities | $ 112 | $ 50

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