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Fair Values of Assets and Liabilities - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
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 $ 489 $ 498  
Other guarantees carrying value $ 198 241  
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 507.00%    
Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Credit valuation adjustment as percentage of derivative contract fair value 2.00%    
Level 2 | Time Deposits | Interest expense      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Net gains (losses) where the fair value option is elected $ 4    
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 $ (46) $ (450) $ (145)