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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, 2023
Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale $ 68 $ 51
Held for sale    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale 68 51
Fair value carrying amount less aggregate unpaid principal - Total loans (8) (7)
Nonaccrual loans 3 5
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans (4) (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 76 58
Nonaccrual loans $ 7 8
Loans 90 days or more past due and still accruing   $ 1