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Fair Values of Assets and Liabilities - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Carrying value of unfunded commitments, deferred non-yield related loan fees and standby letters of credit $ 420   $ 489
Other guarantees carrying value $ 184   $ 198
Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Credit valuation adjustment as percentage of derivative contract fair value 0.00%    
Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Credit valuation adjustment as percentage of derivative contract fair value 1224.00%    
Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Credit valuation adjustment as percentage of derivative contract fair value 1.00%    
Mortgage Loans Held For Sale | Level 2      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Net gains (losses) where the fair value option is elected $ (1) $ (3)  
Time Deposits | Level 2 | Interest Expense      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Net gains (losses) where the fair value option is elected $ 8