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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, 2024 | Dec. 31, 2023
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total loans | $ 87 | $ 68
Held for sale |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total loans | 87 | 68
Fair value carrying amount less aggregate unpaid principal - Total loans | (4) | (5)
Nonaccrual loans | 3 | 2
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans | (2) | (3)
Loans 90 days or more past due and still accruing |  | 1
Fair value carrying amount less aggregate unpaid principal - Loans 90 days or more past due and still accruing |  | 0
Held for sale | Aggregate unpaid principal |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total loans | 91 | 73
Nonaccrual loans | $ 5 | 5
Loans 90 days or more past due and still accruing |  | $ 1

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