Reportable Operating Segments and Geographic Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Non-interest revenues	$ 7,018	$ 6,681	$ 20,699	$ 19,979
Interest income	1,767	1,739	5,223	5,117
Interest expense	484	558	1,495	1,682
Total revenues, net of interest expense	8,301	7,862	24,427	23,414
Net income	1,366	1,250	4,051	3,845
U S Card Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	3,050	2,887	8,991	8,566
Interest income	1,408	1,362	4,148	3,978
Interest expense	172	194	532	568
Total revenues, net of interest expense	4,286	4,055	12,607	11,976
Net income	782	699	2,329	2,169
International Card Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,161	1,126	3,415	3,351
Interest income	281	289	830	858
Interest expense	86	102	273	300
Total revenues, net of interest expense	1,356	1,313	3,972	3,909
Net income	142	164	528	539
Global Commercial Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,277	1,218	3,787	3,718
Interest income	3	3	9	8
Interest expense	59	65	181	192
Total revenues, net of interest expense	1,221	1,156	3,615	3,534
Net income	261	183	678	579
Global Network And Merchant Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,309	1,238	3,856	3,683
Interest income	8	7	23	16
Interest expense	(62)	(65)	(187)	(182)
Total revenues, net of interest expense	1,379	1,310	4,066	3,881
Net income	391	360	1,176	1,089
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	221	212	650	661
Interest income	67	78	213	257
Interest expense	229	262	696	804
Total revenues, net of interest expense	59	28	167	114
Net income	$ (210)	$ (156)	$ (660)	$ (531)