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Revenue - Schedule of Disaggregate Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue
Revenue	$ 2,616	$ 2,490	$ 5,148	$ 4,958
Operating Segments
Disaggregation of Revenue
Revenue	2,616	2,490	5,148	4,958
Recurring
Disaggregation of Revenue
Revenue	2,120	2,010	4,184	4,019
Transaction processing and services | Recurring
Disaggregation of Revenue
Revenue	1,776	1,697	3,502	3,397
Software maintenance | Recurring
Disaggregation of Revenue
Revenue	248	234	492	467
Other recurring | Recurring
Disaggregation of Revenue
Revenue	96	79	190	155
Software license | Non-recurring
Disaggregation of Revenue
Revenue	144	128	273	252
Professional services | Non-recurring
Disaggregation of Revenue
Revenue	231	236	447	465
Other non-recurring fees | Non-recurring
Disaggregation of Revenue
Revenue	121	116	244	222
North America
Disaggregation of Revenue
Revenue	2,039	1,946	4,027	3,864
All others
Disaggregation of Revenue
Revenue	577	544	1,121	1,094
Banking Solutions
Disaggregation of Revenue
Revenue		5		9
Banking Solutions | Operating Segments
Disaggregation of Revenue
Revenue	1,808	1,711	3,526	3,395
Banking Solutions | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	1,523	1,426	2,977	2,842
Banking Solutions | Transaction processing and services | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	1,351	1,273	2,641	2,539
Banking Solutions | Software maintenance | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	98	90	193	180
Banking Solutions | Other recurring | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	74	63	143	123
Banking Solutions | Software license | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	48	37	75	87
Banking Solutions | Professional services | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	128	136	252	268
Banking Solutions | Other non-recurring fees | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	109	112	222	198
Banking Solutions | North America | Operating Segments
Disaggregation of Revenue
Revenue	1,564	1,471	3,056	2,903
Banking Solutions | All others | Operating Segments
Disaggregation of Revenue
Revenue	244	240	470	492
Capital Market Solutions
Disaggregation of Revenue
Revenue		7		14
Capital Market Solutions | Operating Segments
Disaggregation of Revenue
Revenue	765	722	1,529	1,428
Capital Market Solutions | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	561	531	1,126	1,067
Capital Market Solutions | Transaction processing and services | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	390	373	783	751
Capital Market Solutions | Software maintenance | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	150	143	298	286
Capital Market Solutions | Other recurring | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	21	15	45	30
Capital Market Solutions | Software license | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	96	91	198	165
Capital Market Solutions | Professional services | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	102	99	193	195
Capital Market Solutions | Other non-recurring fees | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	6	1	12	1
Capital Market Solutions | North America | Operating Segments
Disaggregation of Revenue
Revenue	452	452	927	897
Capital Market Solutions | All others | Operating Segments
Disaggregation of Revenue
Revenue	313	270	602	531
Corporate and Other
Disaggregation of Revenue
Revenue		9		18
Corporate and Other | Operating Segments
Disaggregation of Revenue
Revenue	43	57	93	135
Corporate and Other | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	36	53	81	110
Corporate and Other | Transaction processing and services | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	35	51	78	107
Corporate and Other | Software maintenance | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	0	1	1	1
Corporate and Other | Other recurring | Recurring | Operating Segments
Disaggregation of Revenue
Revenue	1	1	2	2
Corporate and Other | Software license | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	0	0	0	0
Corporate and Other | Professional services | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	1	1	2	2
Corporate and Other | Other non-recurring fees | Non-recurring | Operating Segments
Disaggregation of Revenue
Revenue	6	3	10	23
Corporate and Other | North America | Operating Segments
Disaggregation of Revenue
Revenue	23	23	44	64
Corporate and Other | All others | Operating Segments
Disaggregation of Revenue
Revenue	$ 20	$ 34	$ 49	$ 71

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