Receivables - Receivables and Receivables held for Sale (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 815	[1]	$ 1,850	[1]	$ 3,858
First Lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	659		1,358		2,871
Second Lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	86		166		329
Real Estate Secured Receivables Held for Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	70		298		364
Real estate secured [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	815		1,822		3,564
Personal non-credit card receivables held for sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 0	[2]	$ 28	[2]	$ 294

[1] The following table summarizes the actions taken during the years ended December 31, 2014, 2013 and 2012 which resulted in the above receivables being classified as a TDR loan. Interest rate modifications of $436 , $692 and $1,814 for the years ended December 31, 2014, 2013 and 2012, respectively; Re-age of past due accounts of $379 , $1,158, and $2,044 for the years ended December 31, 2014, 2013 and 2012, respectively; Total of $815 , $1,850 and $3,858 for the years ended December 31, 2014, 2013 and 2012, respectively.

[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.