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Finance Receivables and Loans, Net (Schedule of Sales of Financing Receivables and Loans) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Sale $ 0 $ 0 $ 0 $ 20
Financing receivable, sales and transfers       131
Loans held-for-sale transferred to finance receivables and loans held-for-investment       79
Consumer portfolio segment | Automotive loan        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Sale $ 0 $ 0 $ 0 $ 20