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Derivative Financial Instruments - Carrying Value of Hedged Items in Fair Value Hedge (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Derivatives, Fair Value [Line Items]    
Carrying amount of hedged items $ 10,325 $ 11,112
Active hedged asset adjustments (1,552) (1,320)
Discontinued hedged asset adjustments (63) (70)
Total hedged asset adjustments $ (1,615) $ (1,390)
Hedged Asset, Statement of Financial Position [Extensible Enumeration] Securities available-for-sale (includes amortized cost of $28.0 billion at both March 31, 2024 and December 31, 2023, an allowance for credit losses of nil at both March 31, 2024 and December 31, 2023, and $863 million and $161 million pledged to creditors at March 31, 2024 and December 31, 2023, respectively) Securities available-for-sale (includes amortized cost of $28.0 billion at both March 31, 2024 and December 31, 2023, an allowance for credit losses of nil at both March 31, 2024 and December 31, 2023, and $863 million and $161 million pledged to creditors at March 31, 2024 and December 31, 2023, respectively)
Deposits    
Derivatives, Fair Value [Line Items]    
Carrying amount of hedged liability items $ 1,451 $ 1,463
Active hedged liability adjustments (108) (104)
Discontinued hedged liability adjustments 59 67
Total hedged liability adjustments $ (49) $ (37)
Hedged Liability, Statement of Financial Position [Extensible Enumeration] Deposits Deposits
Long-term debt    
Derivatives, Fair Value [Line Items]    
Carrying amount of hedged liability items $ 8,864 $ 7,913
Active hedged liability adjustments (448) (407)
Discontinued hedged liability adjustments 63 72
Total hedged liability adjustments $ (385) $ (335)
Hedged Liability, Statement of Financial Position [Extensible Enumeration] Long-term debt (includes $6.9 billion and $7.5 billion designated under fair value option at March 31, 2024 and December 31, 2023, respectively) Long-term debt (includes $6.9 billion and $7.5 billion designated under fair value option at March 31, 2024 and December 31, 2023, respectively)