v3.26.1
Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - Nonrecurring - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value $ 301 $ 423
Fair value adjustment (43) (125)
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 0 13
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 301 410
Commercial loans and leases | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 109 261
Fair value adjustment (17) (126)
Commercial loans and leases | Commercial | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 0 0
Commercial loans and leases | Commercial | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 0 0
Commercial loans and leases | Commercial | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 109 261
Consumer and residential mortgage loans | Consumer    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 166 145
Fair value adjustment (3) (4)
Consumer and residential mortgage loans | Consumer | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 0 0
Consumer and residential mortgage loans | Consumer | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 0 0
Consumer and residential mortgage loans | Consumer | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 166 145
OREO    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value   4
Fair value adjustment   1
OREO | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value   0
OREO | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value   0
OREO | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value   4
Bank premises and equipment    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 26  
Fair value adjustment (23)  
Bank premises and equipment | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 0  
Bank premises and equipment | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 0  
Bank premises and equipment | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value $ 26  
Private equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value   13
Fair value adjustment   4
Private equity investments | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value   0
Private equity investments | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value   13
Private equity investments | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value   $ 0