v3.25.2
Fair Value Measurements - Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs Nonrecurring Basis) (Details) - Nonrecurring - USD ($)
$ in Millions
Jun. 30, 2025
Jun. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value $ 434 $ 275
Commercial loans held for sale | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value   4
Commercial loans and leases | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 222 67
Consumer and residential mortgage loans | Consumer    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 194 196
OREO    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 5 5
Bank premises and equipment    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value   3
Private equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 13 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 421 275
Level 3 | Commercial loans held for sale | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value   4
Level 3 | Commercial loans and leases | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 222 67
Level 3 | Consumer and residential mortgage loans | Consumer    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 194 196
Level 3 | OREO    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 5 5
Level 3 | Bank premises and equipment    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value   3
Level 3 | Private equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 0 0
Level 3 | Comparable Company Analysis | Commercial loans held for sale | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value   4
Level 3 | Comparable Company Analysis | Private equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value   0
Level 3 | Appraised Value | Commercial loans and leases | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 222 67
Level 3 | Appraised Value | Consumer and residential mortgage loans | Consumer    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value 194 196
Level 3 | Appraised Value | OREO    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value $ 5 5
Level 3 | Appraised Value | Bank premises and equipment    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets, fair value   $ 3