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Derivatives (Primary Risks Managed by Derivatives) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 181,765 | $ 173,236
Derivative assets | 3,845 | 3,714
Derivative liabilities | 5,373 | 5,088
Derivatives Designated as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 4,423 | 3,939
Derivative assets | 386 | 348
Derivative liabilities | 31 | 45
Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 177,342 | 169,297
Derivative assets | 3,459 | 3,366
Derivative liabilities | 5,342 | 5,043
Interest rate swaps | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 31,565 | 31,252
Derivative assets | 115 | 140
Derivative liabilities | 144 | 103
Interest rate floors | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 3,500 | 3,500
Derivative assets | 3 | 7
Derivative liabilities | 0 | 1
Interest rate caps | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 7,050 | 7,050
Derivative assets | 20 | 19
Derivative liabilities | 0 | 1
Interest rate options | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 23,580 | 33,680
Derivative assets | 20 | 47
Derivative liabilities | 269 | 167
Interest rate forwards | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 19,649 | 17,017
Derivative assets | 92 | 32
Derivative liabilities | 2,325 | 1,937
Interest rate forwards | Cash flow hedges: | Derivatives Designated as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 500 | 0
Derivative assets | 9 | 0
Derivative liabilities | 0 | 0
Foreign currency swaps | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 737 | 747
Derivative assets | 105 | 101
Derivative liabilities | 0 | 1
Foreign currency swaps | Cash flow hedges: | Derivatives Designated as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 3,923 | 3,939
Derivative assets | 377 | 348
Derivative liabilities | 31 | 45
Foreign currency forwards | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 479 | 535
Derivative assets | 2 | 0
Derivative liabilities | 0 | 9
Credit default swaps — written | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,405 | 1,405
Derivative assets | 29 | 27
Derivative liabilities | 0 | 0
Credit default swaptions | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 300 | 0
Derivative assets | 0 | 0
Derivative liabilities | 1 | 0
Equity index options | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 23,490 | 20,099
Derivative assets | 1,132 | 757
Derivative liabilities | 884 | 687
Equity total return swaps | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 65,287 | 53,742
Derivative assets | 1,940 | 2,236
Derivative liabilities | 1,719 | 2,137
Hybrid options | Derivatives Not Designated or Not Qualifying as Hedging Instruments: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 300 | 270
Derivative assets | 1 | 0
Derivative liabilities | $ 0 | $ 0

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