Receivables Held for Investment, net - Receivables and Receivables held for Sale (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modifications, primarily interest rate modifications	$ 33	$ 41	$ 115	$ 141
Re-age of past due account	25	59	122	216
Total	58	100	237	357
First lien held for investment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	19	33	161
Second lien held for investment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	13	33	41
Real Estate Secured Receivables Held for Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	58	68	171	155
Real estate secured [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 58	$ 100	$ 237	$ 357