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Derivatives (Primary Risks Managed by Derivatives) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 142,534 | $ 116,991
Derivative assets: (1) | 2,642 | 2,284
Derivative liabilities: (1) | 3,253 | 3,920
Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 4,045 | 4,086
Derivative assets: (1) | 552 | 596
Derivative liabilities: (1) | 13 | 20
Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 138,489 | 112,905
Derivative assets: (1) | 2,090 | 1,688
Derivative liabilities: (1) | 3,240 | 3,900
Interest rate swaps | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 14,850 | 3,145
Derivative assets: (1) | 163 | 98
Derivative liabilities: (1) | 94 | 46
Interest rate caps | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 6,300 | 6,350
Derivative assets: (1) | 103 | 137
Derivative liabilities: (1) | 35 | 43
Interest rate options | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 32,388 | 28,688
Derivative assets: (1) | 60 | 22
Derivative liabilities: (1) | 133 | 232
Interest rate forwards | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 17,886 | 18,168
Derivative assets: (1) | 74 | 35
Derivative liabilities: (1) | 1,725 | 2,466
Interest rate forwards | Cash flow hedges: | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 40 | 60
Derivative assets: (1) | 0 | 0
Derivative liabilities: (1) | 6 | 12
Foreign currency swaps | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 811 | 822
Derivative assets: (1) | 138 | 148
Derivative liabilities: (1) | 1 | 0
Foreign currency swaps | Cash flow hedges: | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 4,005 | 4,026
Derivative assets: (1) | 552 | 596
Derivative liabilities: (1) | 7 | 8
Foreign currency forwards | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 497 | 487
Derivative assets: (1) | 3 | 1
Derivative liabilities: (1) | 1 | 10
Credit default swaps — written | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,760 | 1,757
Derivative assets: (1) | 23 | 18
Derivative liabilities: (1) | 1 | 2
Credit default swaptions | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 0 | 100
Derivative assets: (1) | 0 | 0
Derivative liabilities: (1) | 0 | 0
Equity index options | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 17,056 | 17,229
Derivative assets: (1) | 521 | 697
Derivative liabilities: (1) | 390 | 351
Equity total return swaps | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 43,941 | 32,909
Derivative assets: (1) | 998 | 520
Derivative liabilities: (1) | 858 | 747
Interest Rate Floor | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 3,000 | 3,250
Derivative assets: (1) | 7 | 12
Derivative liabilities: (1) | $ 2 | $ 3

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