Business Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions			3 Months Ended		9 Months Ended
		Feb. 18, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenue			$ 3,786	$ 3,128	$ 11,020	$ 6,142
Operating income (loss)			542	374	1,336	1,131
Corporate and Other
Segment Reporting Information [Line Items]
Revenue			218	228	690	473
Operating income (loss)			(745)	(621)	(2,082)	(850)
Acceptance | Operating segments
Segment Reporting Information [Line Items]
Revenue			1,454	1,012	4,078	1,012
Operating income (loss)			423	296	985	296
Fintech | Operating segments
Segment Reporting Information [Line Items]
Revenue			727	735	2,159	2,191
Operating income (loss)			265	223	721	647
Payments | Operating segments
Segment Reporting Information [Line Items]
Revenue			1,387	1,153	4,093	2,466
Operating income (loss)			599	476	1,712	1,038
Processing and services revenue
Segment Reporting Information [Line Items]
Revenue	[1]		3,153	2,608	9,118	5,229
Processing and services revenue | Corporate and Other
Segment Reporting Information [Line Items]
Revenue			10	47	51	148
Processing and services revenue | Acceptance | Operating segments
Segment Reporting Information [Line Items]
Revenue			1,256	867	3,495	867
Processing and services revenue | Fintech | Operating segments
Segment Reporting Information [Line Items]
Revenue			684	692	2,032	2,054
Processing and services revenue | Payments | Operating segments
Segment Reporting Information [Line Items]
Revenue			1,203	1,002	3,540	2,160
Product revenue
Segment Reporting Information [Line Items]
Revenue			633	520	1,902	913
Product revenue | Corporate and Other
Segment Reporting Information [Line Items]
Revenue			208	181	639	325
Product revenue | Acceptance | Operating segments
Segment Reporting Information [Line Items]
Revenue			198	145	583	145
Product revenue | Fintech | Operating segments
Segment Reporting Information [Line Items]
Revenue			43	43	127	137
Product revenue | Payments | Operating segments
Segment Reporting Information [Line Items]
Revenue			$ 184	$ 151	$ 553	$ 306
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 $62 million and $40 million for the three months ended September 30, 2020 and 2019, respectively, and $174 million and $58 million for the nine months ended September 30, 2020 and 2019, respectively (see Note 21).