Reportable Operating Segments and Geographic Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Non-interest revenues	$ 6,934	$ 7,018	$ 21,137	$ 20,699
Interest income	1,815	1,767	5,350	5,223
Interest expense	420	484	1,302	1,495
Total revenues, net of interest expense	8,329	8,301	25,185	24,427
Net income	1,477	1,366	4,438	4,051
U S Card Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	3,214	3,050	9,453	8,991
Interest income	1,465	1,408	4,296	4,148
Interest expense	152	172	455	532
Total revenues, net of interest expense	4,527	4,286	13,294	12,607
Net income	889	782	2,535	2,329
International Card Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,206	1,161	3,571	3,415
Interest income	273	281	825	830
Interest expense	85	86	259	273
Total revenues, net of interest expense	1,394	1,356	4,137	3,972
Net income	142	142	378	528
Global Commercial Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	957	1,277	3,538	3,787
Interest income	4	3	11	9
Interest expense	61	59	186	181
Total revenues, net of interest expense	900	1,221	3,363	3,615
Net income	204	261	949	678
Global Network And Merchant Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,368	1,309	4,027	3,856
Interest income	14	8	35	23
Interest expense	(68)	(62)	(208)	(187)
Total revenues, net of interest expense	1,450	1,379	4,270	4,066
Net income	427	391	1,243	1,176
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	189	221	548	650
Interest income	59	67	183	213
Interest expense	190	229	610	696
Total revenues, net of interest expense	58	59	121	167
Net income	$ (185)	$ (210)	$ (667)	$ (660)