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Derivatives - Schedule of Carrying Amount and the Cumulative Fair Value Hedging Adjustments (Details) - Fair Value Hedging - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Foreign currency swaps | Interest sensitive contract liabilities    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Carrying amount of the hedged liabilities $ 1,945 $ 1,438
Cumulative amount of fair value hedging gains (losses) on liabilities 63 19
Foreign currency interest rate swaps | Interest sensitive contract liabilities    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Carrying amount of the hedged liabilities 4,796 4,010
Cumulative amount of fair value hedging gains (losses) on liabilities 479 363
Interest rate swaps | Interest sensitive contract liabilities    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Carrying amount of the hedged liabilities 13,612 6,910
Cumulative amount of fair value hedging gains (losses) on liabilities 264 189
AFS securities | Foreign currency forwards    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Carrying amount of the hedged assets 6,149 4,883
Cumulative amount of fair value hedging gains (losses) on assets (146) (15)
AFS securities | Foreign currency swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Carrying amount of the hedged assets 6,769 6,820
Cumulative amount of fair value hedging gains (losses) on assets $ (328) $ (141)