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Loans and Interest Receivable - Loans and Interest Receivable, Held for Sale (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Restructuring and other charges   $ 28 $ 0 $ 297 $ 40
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Consumer Receivables          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Sale of financing receivable, consideration received $ 6,900        
Proceeds from sale of finance receivables 6,500        
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Consumer Receivables | 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        
Restructuring and other charges $ 28