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Derivatives - Derivative Balance Sheet Classification (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 7,689 | $ 12,363
Fair Value | 25 | 7
Asset Derivatives | 71 | 57
Liability Derivatives | (46) | (50)
Available-for-sale Securities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 657 | 645
Fair Value | 0 | 0
Asset Derivatives | 0 | 0
Liability Derivatives | 0 | 0
Other investments |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,286 | 1,662
Fair Value | 47 | (1)
Asset Derivatives | 56 | 18
Liability Derivatives | (9) | (19)
Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 5,746 | 10,056
Fair Value | (22) | 8
Asset Derivatives | 15 | 39
Liability Derivatives | (37) | (31)
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 3,582 | 8,269
Fair Value | (1) | (5)
Asset Derivatives | 31 | 27
Liability Derivatives | (32) | (32)
Interest rate swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 3,450 | 3,450
Fair Value | (1) | (1)
Asset Derivatives | 1 | 1
Liability Derivatives | (2) | (2)
Interest rate swaps | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,300 | 6,600
Foreign currency swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 657 | 644
Fair Value | 27 | 13
Asset Derivatives | 39 | 29
Liability Derivatives | (12) | (16)
Total cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 4,107 | 4,094
Fair Value | 26 | 12
Asset Derivatives | 40 | 30
Liability Derivatives | (14) | (18)
Interest rate swaps and futures | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,929 | 6,626
Fair Value | (1) | (5)
Asset Derivatives | 0 | 0
Liability Derivatives | (1) | (5)
Foreign currency swaps and forwards | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 657 | 645
Fair Value | 0 | 0
Asset Derivatives | 0 | 0
Liability Derivatives | 0 | 0
Credit derivatives in offsetting positions | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 996 | 998
Fair Value | 0 | 0
Asset Derivatives | 31 | 27
Liability Derivatives | $ (31) | $ (27)

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