Accounts Receivable and Loans (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	$ 827	$ 1,159	$ 871	$ 1,210
Interest income recognized	13	14	33	30
U S Card Services [Member] | Card Member Loans [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	715	999	760	1,041
Interest income recognized	9	10	25	22
U S Card Services [Member] | Card Member Receivables [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	47	91	47	100
Interest income recognized	0	0	0	0
International Card Services [Member] | Card Member Loans [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	65	69	64	69
Interest income recognized	$ 4	$ 4	$ 8	$ 8