Reportable Operating Segments and Geographic Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Non-interest revenues	$ 7,043	$ 6,844	$ 13,681	$ 13,298
Interest income	1,694	1,671	3,456	3,378
Interest expense	492	550	1,011	1,124
Total revenues, net of interest expense	8,245	7,965	16,126	15,552
Net income	1,405	1,339	2,685	2,595
U S Card Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	3,063	2,925	5,941	5,679
Interest income	1,354	1,302	2,740	2,616
Interest expense	178	190	360	374
Total revenues, net of interest expense	4,239	4,037	8,321	7,921
Net income	743	718	1,547	1,470
International Card Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,130	1,119	2,254	2,225
Interest income	259	276	549	569
Interest expense	90	98	187	198
Total revenues, net of interest expense	1,299	1,297	2,616	2,596
Net income	208	178	386	375
Global Commercial Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,290	1,284	2,510	2,500
Interest income	3	2	6	5
Interest expense	62	65	122	127
Total revenues, net of interest expense	1,231	1,221	2,394	2,378
Net income	226	219	417	396
Global Network And Merchant Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,313	1,259	2,547	2,445
Interest income	8	5	15	9
Interest expense	(63)	(59)	(125)	(117)
Total revenues, net of interest expense	1,384	1,323	2,687	2,571
Net income	412	372	785	729
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	247	257	429	449
Interest income	70	86	146	179
Interest expense	225	256	467	542
Total revenues, net of interest expense	92	87	108	86
Net income	$ (184)	$ (148)	$ (450)	$ (375)