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Fair Value Measurements - Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs Nonrecurring Basis) (Details) - Nonrecurring - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | $ 405 | $ 398
Commercial loans held for sale | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value |  | 47
Commercial loans and leases | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 171 | 125
Consumer and residential mortgage loans | Consumer |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 216 | 208
OREO |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 4 | 6
Bank premises and equipment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 1 | 9
Private equity investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 13 | 3
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 392 | 395
Level 3 | Commercial loans held for sale | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value |  | 47
Level 3 | Commercial loans and leases | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 171 | 125
Level 3 | Consumer and residential mortgage loans | Consumer |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 216 | 208
Level 3 | OREO |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 4 | 6
Level 3 | Bank premises and equipment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 1 | 9
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 |  | 47
Level 3 | Comparable Company Analysis | Private equity investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 0 | 0
Level 3 | Appraised Value | Commercial loans and leases | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 171 | 125
Level 3 | Appraised Value | Consumer and residential mortgage loans | Consumer |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 216 | 208
Level 3 | Appraised Value | OREO |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 4 | 6
Level 3 | Appraised Value | Bank premises and equipment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | $ 1 | $ 9

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