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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue
Revenue	$ 2,812	$ 2,717	$ 2,616	$ 2,532	$ 2,599	$ 2,570	$ 2,490	$ 2,468	$ 10,677	$ 10,127	$ 9,831
Total recurring
Disaggregation of Revenue
Revenue									8,543	8,109	7,847
Total recurring | Transaction processing and services
Disaggregation of Revenue
Revenue									7,136	6,860	6,666
Total recurring | Software maintenance
Disaggregation of Revenue
Revenue									998	940	897
Total recurring | Other recurring
Disaggregation of Revenue
Revenue									409	309	284
Other non-recurring | Software license
Disaggregation of Revenue
Revenue									675	628	508
Other non-recurring | Professional services
Disaggregation of Revenue
Revenue									912	954	962
Other non-recurring | Other non-recurring
Disaggregation of Revenue
Revenue									547	436	514
North America
Disaggregation of Revenue
Revenue									8,306	7,849	7,691
All others
Disaggregation of Revenue
Revenue									2,371	2,278	2,140
Operating Segments
Disaggregation of Revenue
Revenue									10,677	10,127	9,831
Operating Segments | Banking Solutions
Disaggregation of Revenue
Revenue									7,285	6,892	6,743
Operating Segments | Banking Solutions | Total recurring
Disaggregation of Revenue
Revenue									6,110	5,752	5,572
Operating Segments | Banking Solutions | Total recurring | Transaction processing and services
Disaggregation of Revenue
Revenue									5,412	5,146	4,981
Operating Segments | Banking Solutions | Total recurring | Software maintenance
Disaggregation of Revenue
Revenue									389	362	364
Operating Segments | Banking Solutions | Total recurring | Other recurring
Disaggregation of Revenue
Revenue									309	244	227
Operating Segments | Banking Solutions | Other non-recurring | Software license
Disaggregation of Revenue
Revenue									176	196	131
Operating Segments | Banking Solutions | Other non-recurring | Professional services
Disaggregation of Revenue
Revenue									522	551	562
Operating Segments | Banking Solutions | Other non-recurring | Other non-recurring
Disaggregation of Revenue
Revenue									477	393	478
Operating Segments | Banking Solutions | North America
Disaggregation of Revenue
Revenue									6,283	5,893	5,812
Operating Segments | Banking Solutions | All others
Disaggregation of Revenue
Revenue									1,002	999	931
Operating Segments | Capital Market Solutions
Disaggregation of Revenue
Revenue									3,196	2,979	2,766
Operating Segments | Capital Market Solutions | Total recurring
Disaggregation of Revenue
Revenue									2,284	2,145	1,993
Operating Segments | Capital Market Solutions | Total recurring | Transaction processing and services
Disaggregation of Revenue
Revenue									1,578	1,507	1,409
Operating Segments | Capital Market Solutions | Total recurring | Software maintenance
Disaggregation of Revenue
Revenue									607	576	531
Operating Segments | Capital Market Solutions | Total recurring | Other recurring
Disaggregation of Revenue
Revenue									99	62	53
Operating Segments | Capital Market Solutions | Other non-recurring | Software license
Disaggregation of Revenue
Revenue									499	431	369
Operating Segments | Capital Market Solutions | Other non-recurring | Professional services
Disaggregation of Revenue
Revenue									385	399	391
Operating Segments | Capital Market Solutions | Other non-recurring | Other non-recurring
Disaggregation of Revenue
Revenue									28	4	13
Operating Segments | Capital Market Solutions | North America
Disaggregation of Revenue
Revenue									1,916	1,839	1,712
Operating Segments | Capital Market Solutions | All others
Disaggregation of Revenue
Revenue									1,280	1,140	1,054
Operating Segments | Corporate and Other
Disaggregation of Revenue
Revenue									196	256	322
Operating Segments | Corporate and Other | Total recurring
Disaggregation of Revenue
Revenue									149	212	282
Operating Segments | Corporate and Other | Total recurring | Transaction processing and services
Disaggregation of Revenue
Revenue									146	207	276
Operating Segments | Corporate and Other | Total recurring | Software maintenance
Disaggregation of Revenue
Revenue									2	2	2
Operating Segments | Corporate and Other | Total recurring | Other recurring
Disaggregation of Revenue
Revenue									1	3	4
Operating Segments | Corporate and Other | Other non-recurring | Software license
Disaggregation of Revenue
Revenue									0	1	8
Operating Segments | Corporate and Other | Other non-recurring | Professional services
Disaggregation of Revenue
Revenue									5	4	9
Operating Segments | Corporate and Other | Other non-recurring | Other non-recurring
Disaggregation of Revenue
Revenue									42	39	23
Operating Segments | Corporate and Other | North America
Disaggregation of Revenue
Revenue									107	117	167
Operating Segments | Corporate and Other | All others
Disaggregation of Revenue
Revenue									$ 89	$ 139	$ 155

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