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Revenue - Schedule of Disaggregate Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue
Revenue	$ 2,717	$ 2,570	$ 7,865	$ 7,528
Operating Segments
Disaggregation of Revenue
Revenue	2,717	2,570	7,865	7,528
Recurring
Disaggregation of Revenue
Revenue	2,189	2,066	6,372	6,086
Transaction processing and services | Recurring
Disaggregation of Revenue
Revenue	1,830	1,755	5,332	5,153
Software maintenance | Recurring
Disaggregation of Revenue
Revenue	252	234	743	701
Other recurring | Recurring
Disaggregation of Revenue
Revenue	107	77	297	232
Software license | Non-recurring
Disaggregation of Revenue
Revenue	139	147	413	399
Professional services | Non-recurring
Disaggregation of Revenue
Revenue	242	238	690	703
Other non-recurring fees | Non-recurring
Disaggregation of Revenue
Revenue	147	119	390	340
North America
Disaggregation of Revenue
Revenue	2,125	1,999	6,152	5,863
All others
Disaggregation of Revenue
Revenue	592	571	1,713	1,665
Banking Solutions
Disaggregation of Revenue
Revenue		6		15
Banking Solutions | Operating Segments
Disaggregation of Revenue
Revenue	1,894	1,779	5,420	5,174
Banking Solutions | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	1,571	1,479	4,548	4,321
Banking Solutions | Transaction processing and services | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	1,394	1,331	4,035	3,870
Banking Solutions | Software maintenance | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	97	88	290	268
Banking Solutions | Other recurring | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	80	60	223	183
Banking Solutions | Software license | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	44	54	119	141
Banking Solutions | Professional services | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	146	137	399	405
Banking Solutions | Other non-recurring fees | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	133	109	354	307
Banking Solutions | North America | Operating Segments
Disaggregation of Revenue
Revenue	1,625	1,521	4,680	4,424
Banking Solutions | All others | Operating Segments
Disaggregation of Revenue
Revenue	269	258	740	750
Capital Market Solutions
Disaggregation of Revenue
Revenue		7		22
Capital Market Solutions | Operating Segments
Disaggregation of Revenue
Revenue	783	730	2,313	2,158
Capital Market Solutions | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	582	536	1,708	1,604
Capital Market Solutions | Transaction processing and services | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	401	375	1,184	1,126
Capital Market Solutions | Software maintenance | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	154	145	451	432
Capital Market Solutions | Other recurring | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	27	16	73	46
Capital Market Solutions | Software license | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	95	92	294	256
Capital Market Solutions | Professional services | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	95	100	288	295
Capital Market Solutions | Other non-recurring fees | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	11	2	23	3
Capital Market Solutions | North America | Operating Segments
Disaggregation of Revenue
Revenue	481	452	1,409	1,349
Capital Market Solutions | All others | Operating Segments
Disaggregation of Revenue
Revenue	302	278	904	809
Corporate and Other
Disaggregation of Revenue
Revenue		9		27
Corporate and Other | Operating Segments
Disaggregation of Revenue
Revenue	40	61	132	196
Corporate and Other | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	36	51	116	161
Corporate and Other | Transaction processing and services | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	35	49	113	157
Corporate and Other | Software maintenance | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	1	1	2	1
Corporate and Other | Other recurring | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	0	1	1	3
Corporate and Other | Software license | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	0	1	0	2
Corporate and Other | Professional services | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	1	1	3	3
Corporate and Other | Other non-recurring fees | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	3	8	13	30
Corporate and Other | North America | Operating Segments
Disaggregation of Revenue
Revenue	19	26	63	90
Corporate and Other | All others | Operating Segments
Disaggregation of Revenue
Revenue	$ 21	$ 35	$ 69	$ 106

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