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Fair Value of Assets and Liabilities - Schedule of Differences between the Fair Value Carrying Amount of Mortgages Held-for-sale and Aggregate Unpaid Principal Amount (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total loans | $ 139 | $ 85
Held for sale |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total loans | 139 | 85
Fair value carrying amount less aggregate unpaid principal - Total loans | (3) | (4)
Nonaccrual loans | 8 | 3
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans | (3) | (2)
Held for sale | Aggregate unpaid principal |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total loans | 142 | 89
Nonaccrual loans | $ 11 | $ 5

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