Accounts Receivable and Loans (Details 6) (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
Accounts Receivable and Loans Textuals [Abstract]
Difference between pre- and post-modification outstanding balances				$ 4
U S Card Services [Member]
Financing Receivable, Modifications [Line Items]
Number of Accounts	15,000	16,000	46,000	63,000
Aggregated Outstanding Balance	124	140	390	561
Card Member Loans [Member] | U S Card Services [Member]
Financing Receivable, Modifications [Line Items]
Number of Accounts	11,000	12,000	35,000	47,000
Aggregated Outstanding Balance	83	91	261	357
Average basis point reduction in interest rate by class of Card Member loans	9.00%	10.00%	11.00%	11.00%
Card Member Receivables [Member] | U S Card Services [Member]
Financing Receivable, Modifications [Line Items]
Number of Accounts	4,000	4,000	11,000	16,000
Aggregated Outstanding Balance	$ 41	$ 49	$ 129	$ 204
Average payment term extension	12	12	12	12