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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Additional Information [Line Items]      
Pre-tax earnings from foreign operations $ 293 $ 215 $ 382
Other comprehensive income (loss), provision (benefit) 702 447 15
Other comprehensive income (loss), provision (benefit) including HTM portfolio transfer   727  
Increase in valuation allowance 73    
Valuation allowance 296 223  
Accrued interest and penalties expense (benefit) related to income taxes included in income tax expense 16 4 $ 6
Unremitted earnings 1,600    
Amount of unrecognized deferred tax liability, bad debt reserve for tax purposes of qualified lender 69    
Bad debt reserve for tax purposes of qualified lender 287    
Foreign Tax Credit Carryforward      
Additional Information [Line Items]      
Increase in valuation allowance 56    
Internal Revenue Service (IRS)      
Additional Information [Line Items]      
Operating loss carryforwards 36 31  
Operating loss carryforwards, no expiration 26    
State and Local Jurisdiction      
Additional Information [Line Items]      
Operating loss carryforwards 250 237  
Foreign Tax Authority      
Additional Information [Line Items]      
Operating loss carryforwards $ 56 $ 40