Reportable Operating Segments and Geographic Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Non-interest revenues	$ 6,761	$ 6,440	$ 19,927	$ 19,734
Interest income	2,242	1,764	6,237	5,654
Interest expense	567	430	1,532	1,291
Total revenues, net of interest expense	8,436	7,774	24,632	24,097
Net income	1,356	1,142	3,933	4,583
Total assets	168,577	153,000	168,577	153,000	$ 158,893
Total equity	21,085	21,000	21,085	21,000	$ 20,501
U S Consumer Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,976	1,849	5,832	5,947
Interest income	1,509	1,178	4,186	3,847
Interest expense	202	125	519	404
Total revenues, net of interest expense	3,283	2,902	9,499	9,390
Net income	475	401	1,384	2,162
Total assets	87,700	79,000	87,700	79,000
Total equity	7,100	8,000	7,100	8,000
International Consumer and Network Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,277	1,205	3,719	3,587
Interest income	271	231	752	692
Interest expense	65	55	178	167
Total revenues, net of interest expense	1,483	1,381	4,293	4,112
Net income	286	155	713	571
Total assets	38,900	34,000	38,900	34,000
Total equity	2,900	3,000	2,900	3,000
Global Commercial Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	2,360	2,240	6,999	6,710
Interest income	351	282	1,004	913
Interest expense	144	98	382	297
Total revenues, net of interest expense	2,567	2,424	7,621	7,326
Net income	529	466	1,447	1,527
Total assets	52,700	47,000	52,700	47,000
Total equity	7,300	7,000	7,300	7,000
Global Merchant Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,088	1,044	3,191	3,172
Interest income	0	0	1	1
Interest expense	(65)	(60)	(188)	(180)
Total revenues, net of interest expense	1,153	1,104	3,380	3,353
Net income	368	359	1,161	1,089
Total assets	26,700	23,000	26,700	23,000
Total equity	2,600	2,000	2,600	2,000
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	60	102	186	318
Interest income	111	73	294	201
Interest expense	221	212	641	603
Total revenues, net of interest expense	(50)	(37)	(161)	(84)
Net income	(302)	(239)	(772)	(766)
Total assets	(38,000)	(30,000)	(38,000)	(30,000)
Total equity	$ 1,100	$ 1,000	$ 1,100	$ 1,000