Card Member Receivables and Loans (Details 3)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
U.S. Card Services [Member] | Card Member Receivables [Member]
Credit Quality Indicator for Receivables and Loans
Net Write-off Rate	0.99%	1.16%
30 Days Past Due as a % of Total	0.79%	0.97%
International Card Services [Member] | Card Member Receivables [Member]
Credit Quality Indicator for Receivables and Loans
Net Write-off Rate	1.68%	1.94%
30 Days Past Due as a % of Total	1.18%	1.58%
International Card Services [Member] | Card Member Loans [Member]
Credit Quality Indicator for Receivables and Loans
Net Write-off Rate	1.03%	1.19%
30 Days Past Due as a % of Total	0.72%	1.57%
Global Commercial Services [Member] | Card Member Receivables [Member]
Credit Quality Indicator for Receivables and Loans
Net Loss Ratio as a % of Charge Volume	0.07%	0.07%
90 Days Past Billing as a % of Receivables	0.73%	0.69%