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Loans and Interest Receivable - Held for Sale (Details) - Consumer Receivables - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue from Other Value Added Services        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Sale of financing receivable, consideration received       $ 39
Transaction and Loan Losses        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Sale of financing receivable, consideration received       $ 283
Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Sale of finance receivable, consideration received $ 6,900      
Proceeds from sale of finance receivable 6,500      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Long-term Receivable        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Noncash or part noncash divestiture, amount of consideration received 426      
Noncash or part noncash divestiture, present value of consideration received $ 261      
Gain (loss) recorded in restructuring and other expenses   $ 7 $ (40)