Accounts Receivable and Loans (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	$ 786	$ 906
Interest income recognized	17	20
U S Card Services [Member] | Card Member Loans [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	692	793
Interest income recognized	13	16
U S Card Services [Member] | Card Member Receivables [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	38	50
Interest income recognized	0	0
International Card Services [Member] | Card Member Loans [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	56	63
Interest income recognized	$ 4	$ 4