Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 3,786	$ 3,128	$ 11,020	$ 6,142
Operating segments | Acceptance
Disaggregation of Revenue [Line Items]
Revenue	1,454	1,012	4,078	1,012
Operating segments | Fintech
Disaggregation of Revenue [Line Items]
Revenue	727	735	2,159	2,191
Operating segments | Payments
Disaggregation of Revenue [Line Items]
Revenue	1,387	1,153	4,093	2,466
Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	$ 218	$ 228	$ 690	$ 473
Geographic Concentration Risk | Non-US | Sales Revenue, Net
Disaggregation of Revenue [Line Items]
Percentage of concentration risk	14.00%	14.00%	13.00%	10.00%
Processing
Disaggregation of Revenue [Line Items]
Revenue	$ 2,730	$ 2,158	$ 7,842	$ 3,958
Processing | Operating segments | Acceptance
Disaggregation of Revenue [Line Items]
Revenue	1,245	861	3,466	861
Processing | Operating segments | Fintech
Disaggregation of Revenue [Line Items]
Revenue	364	346	1,064	1,030
Processing | Operating segments | Payments
Disaggregation of Revenue [Line Items]
Revenue	1,112	911	3,265	1,938
Processing | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	9	40	47	129
Hardware, print and card production
Disaggregation of Revenue [Line Items]
Revenue	367	285	1,092	458
Hardware, print and card production | Operating segments | Acceptance
Disaggregation of Revenue [Line Items]
Revenue	179	133	531	133
Hardware, print and card production | Operating segments | Fintech
Disaggregation of Revenue [Line Items]
Revenue	12	10	33	33
Hardware, print and card production | Operating segments | Payments
Disaggregation of Revenue [Line Items]
Revenue	176	142	528	292
Hardware, print and card production | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Professional services
Disaggregation of Revenue [Line Items]
Revenue	188	188	542	479
Professional services | Operating segments | Acceptance
Disaggregation of Revenue [Line Items]
Revenue	9	3	20	3
Professional services | Operating segments | Fintech
Disaggregation of Revenue [Line Items]
Revenue	120	126	347	364
Professional services | Operating segments | Payments
Disaggregation of Revenue [Line Items]
Revenue	59	56	174	105
Professional services | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	0	3	1	7
Software maintenance
Disaggregation of Revenue [Line Items]
Revenue	142	148	427	443
Software maintenance | Operating segments | Acceptance
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Software maintenance | Operating segments | Fintech
Disaggregation of Revenue [Line Items]
Revenue	141	144	423	430
Software maintenance | Operating segments | Payments
Disaggregation of Revenue [Line Items]
Revenue	1	1	2	2
Software maintenance | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	0	3	2	11
License and termination fees
Disaggregation of Revenue [Line Items]
Revenue	69	82	219	233
License and termination fees | Operating segments | Acceptance
Disaggregation of Revenue [Line Items]
Revenue	7	4	19	4
License and termination fees | Operating segments | Fintech
Disaggregation of Revenue [Line Items]
Revenue	41	61	139	181
License and termination fees | Operating segments | Payments
Disaggregation of Revenue [Line Items]
Revenue	21	16	61	47
License and termination fees | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	0	1	0	1
Output solutions postage
Disaggregation of Revenue [Line Items]
Revenue	207	180	640	324
Output solutions postage | Operating segments | Acceptance
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Output solutions postage | Operating segments | Fintech
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Output solutions postage | Operating segments | Payments
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Output solutions postage | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	207	180	640	324
Other
Disaggregation of Revenue [Line Items]
Revenue	83	87	258	247
Other | Operating segments | Acceptance
Disaggregation of Revenue [Line Items]
Revenue	14	11	42	11
Other | Operating segments | Fintech
Disaggregation of Revenue [Line Items]
Revenue	49	48	153	153
Other | Operating segments | Payments
Disaggregation of Revenue [Line Items]
Revenue	18	27	63	82
Other | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	$ 2	$ 1	$ 0	$ 1