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Fair Value Disclosures - Measured on a Nonrecurring Basis (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Carrying Value $ 4,914   $ 3,310
Carrying value 5,522   $ 8,373
LHFS | Nonrecurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Valuation Adjustments (52) $ 0  
Carrying value 104 0  
Loans and leases | Nonrecurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Carrying Value 98 98  
Valuation Adjustments (38) (21)  
Foreclosed real estate and other foreclosed property | Nonrecurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Carrying Value 60 62  
Valuation Adjustments $ (129) $ (180)