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Finance Receivables - New Volume of TDR HFI & HFS Finance Receivables (Details) - Personal Loans
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
account
Mar. 31, 2019
USD ($)
account
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Pre-modification TDR net finance receivables $ 158 $ 120
Total post-modification TDR net finance receivables $ 158 $ 120
Number of TDR accounts | account 21,818 18,506
Rate reduction    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total post-modification TDR net finance receivables $ 100 $ 85
Other    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total post-modification TDR net finance receivables $ 58 $ 35