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Deposits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Total deposits $ 145,150 $ 119,693 $ 110,955
Time Deposits, $250,000 or More [Abstract]      
Time Deposits, $250,000 or More 14,502 20,190  
Time Deposits, Fiscal Year Maturity [Abstract]      
0-90 days 9,011    
91-180 days 4,430    
181-365 days 873    
2021 14,314    
2022 1,073    
2023 605    
2024 428    
2025 395    
Thereafter 2,629    
Time deposits 19,444    
Gain on extinguishment of time deposits 12    
Overdraft deposits 392 222  
Domestic Deposits [Member]      
Time Deposits, $250,000 or More [Abstract]      
Time Deposits, $250,000 or More 14,270 19,645  
Time Deposits, Fiscal Year Maturity [Abstract]      
0-90 days 8,899    
91-180 days 4,310    
181-365 days 873    
2021 14,082    
2022 1,073    
2023 605    
2024 428    
2025 395    
Thereafter 2,629    
Time deposits 19,212    
Foreign Deposits [Member]      
Time Deposits, $250,000 or More [Abstract]      
Time Deposits, $250,000 or More 232 545  
Time Deposits, Fiscal Year Maturity [Abstract]      
0-90 days 112    
91-180 days 120    
181-365 days 0    
2021 232    
2022 0    
2023 0    
2024 0    
2025 0    
Thereafter 0    
Time deposits 232    
Deposits [Member]      
Time Deposits, Fiscal Year Maturity [Abstract]      
Fixed-rate senior debt obligations recharacterized as time deposits 5,000    
Deposits [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Deposits at fair value 4,155 7,209  
Other Expense [Member]      
Time Deposits, Fiscal Year Maturity [Abstract]      
FDIC assessment fees $ 71 $ 24 $ 135