Reportable Operating Segments and Geographic Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Non-interest revenues	$ 6,389	$ 6,508
Interest income	1,943	2,005
Interest expense	443	425
Total revenues, net of interest expense	7,889	8,088
Net income	1,237	1,426
Total assets	161,385		$ 158,893
Total equity	20,935	20,501	$ 20,501
U S Consumer Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,857	2,029
Interest income	1,308	1,391
Interest expense	146	140
Total revenues, net of interest expense	3,019	3,280
Net income	469	694
Total assets	81,000	86,000
Total equity	7,000	7,000
International Consumer and Network Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,195	1,140
Interest income	235	227
Interest expense	53	54
Total revenues, net of interest expense	1,377	1,313
Net income	218	188
Total assets	36,000	34,000
Total equity	3,000	3,000
Global Commercial Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	2,271	2,190
Interest income	319	321
Interest expense	109	95
Total revenues, net of interest expense	2,481	2,416
Net income	418	485
Total assets	48,000	47,000
Total equity	7,000	7,000
Global Merchant Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,017	1,041
Interest income	0	0
Interest expense	(58)	(59)
Total revenues, net of interest expense	1,075	1,100
Net income	363	357
Total assets	25,000	24,000
Total equity	3,000	2,000
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	49	108
Interest income	81	66
Interest expense	193	195
Total revenues, net of interest expense	(63)	(21)
Net income	(231)	(298)
Total assets	(29,000)	(32,000)
Total equity	$ 1,000	$ 2,000