Receivables, net - Receivables and Receivables held for Sale (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		$ 451	$ 815	$ 1,850
Modifications, primarily interest rate modifications		174	276	692
Re-age of past due account		277	539	1,158
Total	[1]	451	815	1,850
Amount reclassified as re-ages		160
First lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		177	659	1,358
Second lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		53	86	166
Real Estate Secured Receivables Held for Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		221	70	298
Real estate secured [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		451	815	1,822
Consumer Loan Excluding Credit Card Held-for-Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	[2]	$ 0	$ 0	$ 28

[1] During 2015, it was determined that loan balances totaling $160 million previously reported as modifications in the table above during 2014 should have been reported as a re-age. Accordingly, the modification and re-age information presented in the table above for 2014 has been adjusted. The total amount reported remains unchanged.

[2] As discussed more fully in Note 7, "Receivables Held for Sale," we sold our personal non-credit card receivable portfolio on April 1, 2013.