Business Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions			3 Months Ended		6 Months Ended
		Feb. 18, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Revenue			$ 3,465	$ 1,512	$ 7,234	$ 3,014
Operating income (loss)			165	384	794	757
Corporate and Other
Segment Reporting Information [Line Items]
Revenue			208	119	472	245
Operating income (loss)			(880)	(125)	(1,337)	(229)
Acceptance | Operating segments
Segment Reporting Information [Line Items]
Revenue			1,223	0	2,624	0
Operating income (loss)			245	0	562	0
Fintech | Operating segments
Segment Reporting Information [Line Items]
Revenue			714	731	1,432	1,456
Operating income (loss)			252	221	456	424
Payments | Operating segments
Segment Reporting Information [Line Items]
Revenue			1,320	662	2,706	1,313
Operating income (loss)			548	288	1,113	562
Processing and services revenue
Segment Reporting Information [Line Items]
Revenue	[1]		2,890	1,328	5,965	2,621
Processing and services revenue | Corporate and Other
Segment Reporting Information [Line Items]
Revenue			13	52	41	101
Processing and services revenue | Acceptance | Operating segments
Segment Reporting Information [Line Items]
Revenue			1,049	0	2,239	0
Processing and services revenue | Fintech | Operating segments
Segment Reporting Information [Line Items]
Revenue			675	690	1,348	1,362
Processing and services revenue | Payments | Operating segments
Segment Reporting Information [Line Items]
Revenue			1,153	586	2,337	1,158
Product revenue
Segment Reporting Information [Line Items]
Revenue			575	184	1,269	393
Product revenue | Corporate and Other
Segment Reporting Information [Line Items]
Revenue			195	67	431	144
Product revenue | Acceptance | Operating segments
Segment Reporting Information [Line Items]
Revenue			174	0	385	0
Product revenue | Fintech | Operating segments
Segment Reporting Information [Line Items]
Revenue			39	41	84	94
Product revenue | Payments | Operating segments
Segment Reporting Information [Line Items]
Revenue			$ 167	$ 76	$ 369	$ 155
Investment Services Business
Segment Reporting Information [Line Items]
Controlling interest sold (as a percent)		60.00%

[1] Includes processing and other fees charged to related party investments accounted for under the equity method of $55 million and $9 million for the three months ended June 30, 2020 and 2019, respectively, and $112 million and $18 million for the six months ended June 30, 2020 and 2019, respectively (see Note 21).