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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
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale $ 301 $ 405
Loans held for investment 0 16
Fair value carrying amount less aggregate unpaid principal - Total loans   (1)
Nonaccrual loans   1
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans   0
Held for sale    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale 301 405
Fair value carrying amount less aggregate unpaid principal - Total loans (4) (37)
Nonaccrual loans 4 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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held for investment   17
Nonaccrual loans   1
Aggregate unpaid principal | Held for sale    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Loans held-for-sale 305 442
Nonaccrual loans 7 $ 5
Loans 90 days or more past due and still accruing $ 1