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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, 2021
Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale $ 449 $ 405
Loans held for investment 17 16
Fair value carrying amount less aggregate unpaid principal - Total loans 0 (1)
Nonaccrual loans 1 1
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans 0 0
Held for sale    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale 449 405
Fair value carrying amount less aggregate unpaid principal - Total loans 4 (37)
Nonaccrual loans 2 2
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans (3) (3)
Aggregate unpaid principal    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held for investment 17 17
Nonaccrual loans 1 1
Aggregate unpaid principal | Held for sale    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale 445 442
Nonaccrual loans $ 5 $ 5