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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 | Jun. 30, 2026 | Jun. 30, 2025
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | $ 439 | $ 434
Commercial loans and leases | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 195 | 222
Consumer and residential mortgage loans | Consumer |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 207 | 194
OREO |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 1 | 5
Bank premises and equipment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 36 |
Private equity investments |  |
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 | 439 | 421
Level 3 | Commercial loans and leases | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 195 | 222
Level 3 | Consumer and residential mortgage loans | Consumer |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 207 | 194
Level 3 | OREO |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 1 | 5
Level 3 | Bank premises and equipment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 36 |
Level 3 | 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 | 195 | 222
Level 3 | Appraised Value | Consumer and residential mortgage loans | Consumer |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 207 | 194
Level 3 | Appraised Value | OREO |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 1 | $ 5
Level 3 | Appraised Value | Bank premises and equipment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | 36 |
Level 3 | Comparable Company Analysis | Private equity investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, fair value | $ 0 |

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