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Fair Value Measurements - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Net fair value of the interest rate lock commitments $ 8,000,000   $ 8,000,000    
Change in the fair value of the interest rate lock commitments, due to decrease in current interest rates of 25 bps 3,000,000   3,000,000    
Change in the fair value of the interest rate lock commitments, due to decrease in current interest rates of 50 bps 6,000,000   6,000,000    
Change in the fair value of the interest rate lock commitments, due to increase in current interest rates of 25 bps 3,000,000   3,000,000    
Change in the fair value of the interest rate lock commitments, due to increase in current interest rates of 50 bps 7,000,000   7,000,000    
Change in fair value of interest rate lock commitments, due to 10% adverse changes in the assumed loan closing rates 1,000,000   1,000,000    
Change in fair value of interest rate lock commitments, due to 20% adverse changes in the assumed loan closing rates 2,000,000   2,000,000    
Change in fair value of interest rate lock commitments, due to 10% favorable changes in the assumed loan closing rates 1,000,000   1,000,000    
Change in fair value of interest rate lock commitments, due to 20% favorable changes in the assumed loan closing rates 2,000,000   2,000,000    
Gain resulting from observable price changes 0 $ 0 0 $ 4,000,000  
Private equity, cumulative observable price change 40,000,000   40,000,000    
Private equity, impairment 1,000,000 1,000,000 2,000,000 11,000,000  
Private equity, cumulative impairment 31,000,000   31,000,000    
Fair value of embedded derivatives 0   0   $ 0
Gain on embedded derivatives 0 0 0 11,000,000  
Other Real Estate Owned          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Fair value adjustment (1,000,000) 0 (1,000,000) (1,000,000)  
Transfer | Other Real Estate Owned          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Fair value gains (losses) $ 0 $ 0 0 0  
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     13,000,000 $ 9,000,000  
FVO valuation adjustments related to instrument-specific credit risk     $ 0   $ 1,000,000