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Commitments and Contingencies - Off-Balance Sheet Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Residential mortgage      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Notional amount $ 173 $ 200 $ 244
CRE      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Notional amount 9,661 9,955  
Other consumer      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Notional amount 1,032 723  
Commitments to extend, originate, or purchase credit and other commitments      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Notional amount 207,285 216,838  
Letters of credit      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Notional amount $ 6,239 $ 6,030