Accounts Receivable and Loans (Details 7) (U S Card Services [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014 Account	Sep. 30, 2013 Account	Sep. 30, 2014 Account	Sep. 30, 2013 Account
Financing Receivable, Modifications [Line Items]
Number of Accounts	3,000	5,000	8,000	18,000
Aggregated Outstanding Balance Upon Payment Default	$ 29	$ 45	$ 87	$ 171
Card Member Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Accounts	2,000	4,000	6,000	15,000
Aggregated Outstanding Balance Upon Payment Default	20	37	60	138
Card Member Receivables [Member]
Financing Receivable, Modifications [Line Items]
Number of Accounts	1,000	1,000	2,000	3,000
Aggregated Outstanding Balance Upon Payment Default	$ 9	$ 8	$ 27	$ 33