Reportable Operating Segments and Geographic Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Non-interest revenues	$ 6,688	$ 6,908	$ 20,052	$ 21,059
Interest income	1,904	1,815	5,598	5,350
Interest expense	399	420	1,223	1,302
Total revenues, net of interest expense	8,193	8,303	24,427	25,107
Net income	1,266	1,477	4,264	4,438
U S Card Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	3,302	3,188	9,822	9,375
Interest income	1,593	1,465	4,639	4,296
Interest expense	166	152	481	455
Total revenues, net of interest expense	4,729	4,501	13,980	13,216
Net income	794	889	2,614	2,535
International Card Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,071	1,206	3,214	3,571
Interest income	226	273	706	825
Interest expense	59	85	183	259
Total revenues, net of interest expense	1,238	1,394	3,737	4,137
Net income	89	142	348	378
Global Commercial Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	858	957	2,653	3,538
Interest income	3	4	10	11
Interest expense	44	61	138	186
Total revenues, net of interest expense	817	900	2,525	3,363
Net income	151	204	534	949
Global Network And Merchant Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,302	1,368	3,898	4,027
Interest income	26	14	69	35
Interest expense	(42)	(68)	(143)	(208)
Total revenues, net of interest expense	1,370	1,450	4,110	4,270
Net income	462	427	1,354	1,243
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	155	189	465	548
Interest income	56	59	174	183
Interest expense	172	190	564	610
Total revenues, net of interest expense	39	58	75	121
Net income	$ (230)	$ (185)	$ (586)	$ (667)