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Derivatives - Derivative Balance Sheet Classification (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 6,757 | $ 7,081
Fair Value | 31 | 45
Asset Derivatives | 67 | 88
Liability Derivatives | (36) | (43)
Available-for-sale Securities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 607 | 647
Fair Value | 0 | 0
Asset Derivatives | 0 | 0
Liability Derivatives | 0 | 0
Other investments |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,177 | 3,011
Fair Value | 36 | 57
Asset Derivatives | 40 | 66
Liability Derivatives | (4) | (9)
Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 4,973 | 3,423
Fair Value | (5) | (12)
Asset Derivatives | 27 | 22
Liability Derivatives | (32) | (34)
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,926 | 2,210
Fair Value | (2) | 4
Asset Derivatives | 23 | 36
Liability Derivatives | (25) | (32)
Interest rate swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 4,225 | 4,225
Fair Value | 0 | 0
Asset Derivatives | 0 | 0
Liability Derivatives | 0 | 0
Interest rate swaps | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 333 | 344
Foreign currency swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 606 | 646
Fair Value | 33 | 41
Asset Derivatives | 44 | 52
Liability Derivatives | (11) | (11)
Total cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 4,831 | 4,871
Fair Value | 33 | 41
Asset Derivatives | 44 | 52
Liability Derivatives | (11) | (11)
Interest rate swaps and futures | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 333 | 344
Fair Value | (2) | 0
Asset Derivatives | 0 | 1
Liability Derivatives | (2) | (1)
Foreign currency swaps | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 607 | 647
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 | 986 | 986
Fair Value | 0 | 0
Asset Derivatives | 23 | 31
Liability Derivatives | (23) | (31)
Equity Option [Member] | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 0 | 233
Fair Value | 0 | 4
Asset Derivatives | 0 | 4
Liability Derivatives | $ 0 | $ 0

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