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Fair Value of Assets and Liabilities - Summary Of Differences Between The Fair Value Carrying Amount Of Mortgages Held-For-Sale And Aggregate Unpaid Principal Amount (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale $ 84 $ 68
Held for sale    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale 84 68
Fair value carrying amount less aggregate unpaid principal - Total loans (5) (5)
Nonaccrual loans 2 2
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans (3) (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
Aggregate unpaid principal | Held for sale    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale 89 73
Nonaccrual loans $ 5 5
Loans 90 days or more past due and still accruing   $ 1