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Fair Value Measurements - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Net fair value of the interest rate lock commitments $ 91,000,000   $ 91,000,000    
Change in the fair value of the interest rate lock commitments, due to decrease in current interest rates of 25 bps 13,000,000   13,000,000    
Change in the fair value of the interest rate lock commitments, due to decrease in current interest rates of 50 bps 24,000,000   24,000,000    
Change in the fair value of the interest rate lock commitments, due to increase in current interest rates of 25 bps 17,000,000   17,000,000    
Change in the fair value of the interest rate lock commitments, due to increase in current interest rates of 50 bps 35,000,000   35,000,000    
Change in fair value of interest rate lock commitments, due to 10% adverse changes in the assumed loan closing rates 9,000,000   9,000,000    
Change in fair value of interest rate lock commitments, due to 20% adverse changes in the assumed loan closing rates 18,000,000   18,000,000    
Change in fair value of interest rate lock commitments, due to 10% favorable changes in the assumed loan closing rates 9,000,000   9,000,000    
Change in fair value of interest rate lock commitments, due to 20% favorable changes in the assumed loan closing rates 18,000,000   18,000,000    
Private equity, observable price change adjustment 0 $ 6,000,000 0 $ 11,000,000  
Private equity, cumulative observable price change 47,000,000   47,000,000    
Private equity, impairment 0 2,000,000 9,000,000 5,000,000  
Private equity, cumulative impairment 26,000,000   26,000,000    
Fair value changes included in earnings for instruments for which the fair value option was elected     45,000,000 36,000,000  
Residential Mortgage          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
FVO valuation adjustments related to instrument-specific credit risk     1,000,000   $ 1,000,000
Commercial          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
FVO valuation adjustments related to instrument-specific credit risk     0   $ 0
Commercial loans held for sale | Commercial          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Fair value adjustment 1,000,000   4,000,000    
Other Real Estate Owned          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Fair value adjustment $ 1,000,000 $ 1,000,000 4,000,000 2,000,000  
Other Real Estate Owned | Transfer          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Fair value gains or losses     $ 2,000,000 $ 1,000,000