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Derivative Instruments - Cumulative Basis Adjustments for Fair Value Hedges (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Derivatives, Fair Value [Line Items]    
Amortized cost of the hedged assets $ 497 $ 484
Amortized cost of the hedged liabilities (691) (676)
Cumulative fair value hedging adjustment included in the amortized cost of the hedged assets 19 7
Cumulative fair value hedging adjustment included in the amortized cost of the hedged assets (liabilities) 184 199
Discontinued Hedges    
Derivatives, Fair Value [Line Items]    
Cumulative fair value hedging adjustment included in the amortized cost of the hedged assets (liabilities) $ (306) $ (310)