Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Non-interest revenues
Discount revenue	$ 4,945	$ 4,729	$ 9,591	$ 9,167
Net card fees	687	647	1,361	1,300
Travel commissions and fees	500	495	923	932
Other commissions and fees	624	605	1,242	1,178
Other	585	567	1,086	1,104
Total non-interest revenues	7,341	7,043	14,203	13,681
Interest income
Interest on loans	1,696	1,622	3,407	3,305
Interest and dividends on investment securities	45	52	91	105
Deposits with banks and other	18	20	37	46
Total interest income	1,759	1,694	3,535	3,456
Interest expense
Deposits	91	107	185	221
Long-term debt and other	352	385	697	790
Total interest expense	443	492	882	1,011
Net interest income	1,316	1,202	2,653	2,445
Total revenues net of interest expense	8,657	8,245	16,856	16,126
Provisions for losses
Charge card	183	161	398	315
Card Member loans	282	334	532	577
Other	24	23	44	42
Total provisions for losses	489	518	974	934
Total revenues net of interest expense after provisions for losses	8,168	7,727	15,882	15,192
Expenses
Marketing, promotion, rewards and Card Member services	2,950	2,580	5,367	4,910
Salaries and employee benefits	1,658	1,543	3,198	3,158
Other, net	1,248	1,609	2,797	3,220
Total expenses	5,856	5,732	11,362	11,288
Pretax income	2,312	1,995	4,520	3,904
Income tax provision	783	590	1,559	1,219
Net income	$ 1,529	$ 1,405	$ 2,961	$ 2,685
Earnings Per Common Share, Basic [Abstract]
Income from continuing operations attributable to common shareholders	$ 1.44	$ 1.28	$ 2.78	$ 2.43
Earnings Per Common Share, Diluted [Abstract]
Income from continuing operations attributable to common shareholders	$ 1.43	$ 1.27	$ 2.77	$ 2.42
Average common shares outstanding for earnings per common share:
Basic	1,052	1,090	1,056	1,094
Diluted	1,058	1,097	1,062	1,101
Cash dividends declared per common share	$ 0.26	$ 0.23	$ 0.49	$ 0.43