Receivables - Receivables and Receivables held for Sale (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 151	[1]	$ 272	[1]
First Lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	125		225
Second Lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	16		28
Real Estate Secured Receivables Held for Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 10		$ 19

[1] The following table summarizes the actions taken during the three months ended March 31, 2015, and 2014 which resulted in the above receivables being classified as a TDR loan. Interest rate modifications of $60 and $84 for the three months ended March 31, 2015 and 2014, respectively; Re-age of past due accounts of $91 and $188 for the three months ended March 31, 2015 and 2014, respectively; Total of $151 and $272 for the three months ended March 31, 2015 and 2014, respectively.