Reportable Operating Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Non-interest revenues	$ 8,786	$ 8,183	$ 25,855	$ 24,233
Revenue from contracts with customers	7,051	6,654	20,827	19,716
Interest income	3,080	2,738	8,999	7,740
Interest expense	877	777	2,663	2,109
Total revenues, net of interest expense	10,989	10,144	32,191	29,864
Net income	1,755	1,654	5,066	4,911
Total assets	194,184	189,000	194,184	189,000	$ 188,602
Global Consumer Services Group [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	4,048	3,680	11,790	10,849
Revenue from contracts with customers	2,788	2,577	8,153	7,611
Interest income	2,402	2,140	6,971	6,083
Interest expense	457	404	1,380	1,101
Total revenues, net of interest expense	5,993	5,416	17,381	15,831
Net income	857	779	2,416	2,375
Total assets	99,000	100,000	99,000	100,000
Global Commercial Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	3,155	2,980	9,342	8,795
Revenue from contracts with customers	2,722	2,593	8,070	7,628
Interest income	485	416	1,407	1,186
Interest expense	255	218	753	593
Total revenues, net of interest expense	3,385	3,178	9,996	9,388
Net income	629	606	1,859	1,716
Total assets	54,000	53,000	54,000	53,000
Global Merchant and Network Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,563	1,494	4,653	4,539
Revenue from contracts with customers	1,540	1,479	4,595	4,465
Interest income	6	6	22	22
Interest expense	(94)	(78)	(288)	(205)
Total revenues, net of interest expense	1,663	1,578	4,963	4,766
Net income	600	580	1,863	1,639
Total assets	17,000	21,000	17,000	21,000
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	20	29	70	50
Revenue from contracts with customers	1	5	9	12
Interest income	187	176	599	449
Interest expense	259	233	818	620
Total revenues, net of interest expense	(52)	(28)	(149)	(121)
Net income	(331)	(311)	(1,072)	(819)
Total assets	$ 24,000	$ 15,000	$ 24,000	$ 15,000