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Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Net fair value of the interest rate lock commitments $ 3   $ 3    
Change in the fair value of the interest rate lock commitments, due to decrease in current interest rates of 25 bps 5   5    
Change in the fair value of the interest rate lock commitments, due to decrease in current interest rates of 50 bps 10   10    
Change in the fair value of the interest rate lock commitments, due to increase in current interest rates of 25 bps 6   6    
Change in the fair value of the interest rate lock commitments, due to increase in current interest rates of 50 bps 12   12    
Change in fair value of interest rate lock commitments, due to 10% adverse changes in the assumed loan closing rates 0   0    
Change in fair value of interest rate lock commitments, due to 10% favorable changes in the assumed loan closing rates 0   0    
Change in fair value of interest rate lock commitments, due to 20% adverse changes in the assumed loan closing rates 1   1    
Change in fair value of interest rate lock commitments, due to 20% favorable changes in the assumed loan closing rates 1   1    
Gain resulting from observable price changes 0 $ 10 4 $ 10  
Private equity, cumulative observable price change 45   45    
Private equity, impairment 1 2 12 2  
Private equity, cumulative impairment 34   34    
Fair value of embedded derivatives 0   0   $ 89
Gain on embedded derivatives 0   11 0  
Loss on embedded derivatives   1      
Other Real Estate Owned          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Fair value adjustment 0 0 0 0  
Transfer | Other Real Estate Owned          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Fair value gains (losses) $ 0 0 0 (6)  
Commercial | Commercial loans held for sale          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Fair value adjustment   0   1  
Fair value gains (losses)   $ 0   1  
Residential Mortgage          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Fair value changes included in earnings for instruments for which the fair value option was elected     (49) $ 46  
FVO valuation adjustments related to instrument-specific credit risk     $ (1)   $ 0