Reportable Operating Segments and Geographic Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Non-interest revenues	$ 6,777	$ 6,786	$ 13,166	$ 13,294
Interest income	2,052	1,885	3,995	3,890
Interest expense	522	436	965	861
Total revenues, net of interest expense	8,307	8,235	16,196	16,323
Net income	1,340	2,015	2,577	3,441
Total assets	166,997	160,000	166,997	160,000	$ 158,893
Total equity	21,175	21,000	21,175	21,000	$ 20,501
U S Consumer Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,999	2,069	3,856	4,098
Interest income	1,369	1,278	2,677	2,669
Interest expense	171	139	317	279
Total revenues, net of interest expense	3,197	3,208	6,216	6,488
Net income	440	1,067	909	1,761
Total assets	86,800	81,000	86,800	81,000
Total equity	7,100	7,000	7,100	7,000
International Consumer and Network Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,247	1,242	2,442	2,382
Interest income	246	234	481	461
Interest expense	60	58	113	112
Total revenues, net of interest expense	1,433	1,418	2,810	2,731
Net income	209	228	427	416
Total assets	37,600	34,500	37,600	34,500
Total equity	2,800	3,100	2,800	3,100
Global Commercial Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	2,368	2,280	4,639	4,470
Interest income	334	310	653	631
Interest expense	129	104	238	199
Total revenues, net of interest expense	2,573	2,486	5,054	4,902
Net income	500	576	918	1,061
Total assets	51,000	45,900	51,000	45,900
Total equity	7,400	8,000	7,400	8,000
Global Merchant Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,086	1,087	2,103	2,128
Interest income	1	1	1	1
Interest expense	(65)	(61)	(123)	(120)
Total revenues, net of interest expense	1,152	1,149	2,227	2,249
Net income	430	373	793	730
Total assets	25,500	24,000	25,500	24,000
Total equity	2,700	2,000	2,700	2,000
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	77	108	126	216
Interest income	102	62	183	128
Interest expense	227	196	420	391
Total revenues, net of interest expense	(48)	(26)	(111)	(47)
Net income	(239)	(229)	(470)	(527)
Total assets	(35,000)	(26,000)	(35,000)	(26,000)
Total equity	$ 1,000	$ 1,000	$ 1,000	$ 1,000