Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 3,755	$ 3,769
Operating segments | Acceptance
Disaggregation of Revenue [Line Items]
Revenue	1,397	1,401
Operating segments | Fintech
Disaggregation of Revenue [Line Items]
Revenue	736	718
Operating segments | Payments
Disaggregation of Revenue [Line Items]
Revenue	1,405	1,386
Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	$ 217	$ 264
Geographic Concentration Risk | Non-US | Revenue from Contract with Customer Benchmark
Disaggregation of Revenue [Line Items]
Percentage of concentration risk	13.00%	13.00%
Processing
Disaggregation of Revenue [Line Items]
Revenue	$ 2,645	$ 2,649
Processing | Operating segments | Acceptance
Disaggregation of Revenue [Line Items]
Revenue	1,178	1,183
Processing | Operating segments | Fintech
Disaggregation of Revenue [Line Items]
Revenue	378	351
Processing | Operating segments | Payments
Disaggregation of Revenue [Line Items]
Revenue	1,077	1,090
Processing | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	12	25
Hardware, print and card production
Disaggregation of Revenue [Line Items]
Revenue	433	397
Hardware, print and card production | Operating segments | Acceptance
Disaggregation of Revenue [Line Items]
Revenue	190	193
Hardware, print and card production | Operating segments | Fintech
Disaggregation of Revenue [Line Items]
Revenue	11	12
Hardware, print and card production | Operating segments | Payments
Disaggregation of Revenue [Line Items]
Revenue	232	192
Hardware, print and card production | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	0	0
Professional services
Disaggregation of Revenue [Line Items]
Revenue	183	173
Professional services | Operating segments | Acceptance
Disaggregation of Revenue [Line Items]
Revenue	9	3
Professional services | Operating segments | Fintech
Disaggregation of Revenue [Line Items]
Revenue	111	112
Professional services | Operating segments | Payments
Disaggregation of Revenue [Line Items]
Revenue	63	57
Professional services | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	0	1
Software maintenance
Disaggregation of Revenue [Line Items]
Revenue	141	144
Software maintenance | Operating segments | Acceptance
Disaggregation of Revenue [Line Items]
Revenue	0	0
Software maintenance | Operating segments | Fintech
Disaggregation of Revenue [Line Items]
Revenue	139	141
Software maintenance | Operating segments | Payments
Disaggregation of Revenue [Line Items]
Revenue	2	1
Software maintenance | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	0	2
License and termination fees
Disaggregation of Revenue [Line Items]
Revenue	61	74
License and termination fees | Operating segments | Acceptance
Disaggregation of Revenue [Line Items]
Revenue	10	6
License and termination fees | Operating segments | Fintech
Disaggregation of Revenue [Line Items]
Revenue	38	46
License and termination fees | Operating segments | Payments
Disaggregation of Revenue [Line Items]
Revenue	13	22
License and termination fees | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	0	0
Output solutions postage
Disaggregation of Revenue [Line Items]
Revenue	205	236
Output solutions postage | Operating segments | Acceptance
Disaggregation of Revenue [Line Items]
Revenue	0	0
Output solutions postage | Operating segments | Fintech
Disaggregation of Revenue [Line Items]
Revenue	0	0
Output solutions postage | Operating segments | Payments
Disaggregation of Revenue [Line Items]
Revenue	0	0
Output solutions postage | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	205	236
Other
Disaggregation of Revenue [Line Items]
Revenue	87	96
Other | Operating segments | Acceptance
Disaggregation of Revenue [Line Items]
Revenue	10	16
Other | Operating segments | Fintech
Disaggregation of Revenue [Line Items]
Revenue	59	56
Other | Operating segments | Payments
Disaggregation of Revenue [Line Items]
Revenue	18	24
Other | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	$ 0	$ 0