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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Additional Information [Line Items]          
Tax benefit recognized from IRS approved method change $ 284        
Charges associated with impacts of the Tax Act   $ 1,800      
Pre-tax earnings from foreign operations     $ 215 $ 382 $ 410
Other comprehensive income (loss), provision (benefit)     447 15 (134)
Accrued interest and penalties expense (benefit) related to income taxes included in income tax expense     4 6 5
Provisional liability accrued for repatriation of undistributed foreign earnings 111     111  
Undistributed earnings of foreign subsidiaries 1,500     1,500  
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    
Internal Revenue Service (IRS)          
Additional Information [Line Items]          
Operating loss carryforwards 1   31 1  
Operating loss carryforwards, no expiration     12    
State and Local Jurisdiction          
Additional Information [Line Items]          
Operating loss carryforwards 253   237 253  
Foreign Tax Authority          
Additional Information [Line Items]          
Operating loss carryforwards $ 19   40 19  
AOCI          
Additional Information [Line Items]          
Other comprehensive income (loss), provision (benefit)     $ 727 $ 15 $ (134)