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Finance Receivables - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Net finance receivables $ 17,817 $ 17,817     $ 18,389      
Financing receivable, allowance for credit loss 2,324 2,324     829      
Finance receivables held for sale $ 54 $ 54     64      
ASU 2016-13 | Purchased credit impaired finance receivables                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Net finance receivables       $ 15        
Financing receivable, allowance for credit loss       $ 15        
Unlikely to be Collected Financing Receivable                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Threshold period past due 60 days 60 days            
Nonperforming                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Threshold period past due 90 days 90 days            
Reversal of net accrued finance charges $ 16 $ 66            
Finance charges recognized from the contractual interest portion of payments received on nonaccrual finance receivables 3 12            
Finance receivable - Personal loan                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Net finance receivables 17,817 17,817     18,389      
Financing receivable, allowance for credit loss 2,324 2,324 $ 2,324   829 $ 798 $ 744 $ 731
Finance receivable - Personal loan | Purchased credit impaired finance receivables                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Net finance receivables $ 0 $ 0     $ 40      
Finance receivable - Personal loan | Minimum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Finance receivables, original term   3 years            
Finance receivable - Personal loan | Maximum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Finance receivables, original term   6 years