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Derivative Instruments - Cumulative Basis Adjustments for Fair Value Hedges (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Derivatives, Fair Value [Line Items]    
Amortized cost of the hedged assets $ 510 $ 534
Amortized cost of the hedged liabilities (686) (703)
Cumulative fair value hedging adjustment included in the amortized cost of the hedged assets 21 39
Cumulative fair value hedging adjustment included in the amortized cost of the hedged assets (liabilities) 189 172
Discontinued Hedges    
Derivatives, Fair Value [Line Items]    
Cumulative fair value hedging adjustment included in the amortized cost of the hedged assets (liabilities) $ (322) $ (326)