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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
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale $ 405 $ 14
Loans held for investment 16 0
Fair value carrying amount less aggregate unpaid principal - Total loans (1) (5)
Nonaccrual loans 1 4
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans 0 (3)
Held for sale    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale 405  
Fair value carrying amount less aggregate unpaid principal - Total loans (37)  
Nonaccrual loans 2  
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans (3)  
Aggregate unpaid principal    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale   19
Loans held for investment 17  
Nonaccrual loans 1 $ 7
Aggregate unpaid principal | Held for sale    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale 442  
Nonaccrual loans $ 5