Reportable Operating Segments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Non-interest revenues	$ 7,980	$ 8,305
Revenue from contracts with customers	6,296	6,697
Interest income	3,046	2,954
Interest expense	716	895
Total revenues net of interest expense	10,310	10,364
Net income (loss)	367	1,550
Total assets	186,060	197,000	$ 198,321
Global Consumer Services Group [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	3,894	3,912
Revenue from contracts with customers	2,693	2,824
Interest income	2,411	2,272
Interest expense	328	435
Total revenues net of interest expense	5,977	5,749
Net income (loss)	201	954
Total assets	87,000	99,000
Global Commercial Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	2,788	2,926
Revenue from contracts with customers	2,372	2,541
Interest income	499	454
Interest expense	200	256
Total revenues net of interest expense	3,087	3,124
Net income (loss)	38	512
Total assets	47,000	54,000
Global Merchant and Network Services [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	1,346	1,449
Revenue from contracts with customers	1,245	1,330
Interest income	6	9
Interest expense	(36)	(80)
Total revenues net of interest expense	1,388	1,538
Net income (loss)	417	571
Total assets	10,000	22,000
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Non-interest revenues	(48)	18
Revenue from contracts with customers	(14)	2
Interest income	130	219
Interest expense	224	284
Total revenues net of interest expense	(142)	(47)
Net income (loss)	(289)	(487)
Total assets	$ 42,000	$ 22,000