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Commitments and Contingencies - Off-Balance Sheet Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
CRE    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount $ 9,642 $ 9,661
Other consumer    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 1,538 1,032
Residential mortgage    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 158 173
Commitments to extend, originate, or purchase credit and other commitments    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 206,600 207,285
Letters of credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount $ 6,843 $ 6,239