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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
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale $ 143 $ 258
Held for sale    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale 143 258
Fair value carrying amount less aggregate unpaid principal - Total loans (5) (6)
Nonaccrual loans 4 4
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans (3) (3)
Aggregate unpaid principal | Held for sale    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale 148 264
Nonaccrual loans $ 7 $ 7