Revenue - Disaggregate Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue
Revenue	$ 2,489	$ 2,415	$ 7,311	$ 7,194
Recurring
Disaggregation of Revenue
Revenue	2,040	1,928	5,983	5,785
Transaction processing and services \| Recurring
Disaggregation of Revenue
Revenue	1,714	1,637	5,041	4,909
Software maintenance \| Recurring
Disaggregation of Revenue
Revenue	227	212	668	646
Other recurring \| Recurring
Disaggregation of Revenue
Revenue	99	79	274	230
Software license \| Non-recurring
Disaggregation of Revenue
Revenue	131	135	314	334
Professional services \| Non-recurring
Disaggregation of Revenue
Revenue	224	259	736	773
Other non-recurring fees \| Non-recurring
Disaggregation of Revenue
Revenue	94	93	278	302
North America
Disaggregation of Revenue
Revenue	1,956	1,885	5,759	5,608
All others
Disaggregation of Revenue
Revenue	533	530	1,552	1,586
Banking Solutions
Disaggregation of Revenue
Revenue	1,756	1,703	5,144	5,039
Banking Solutions \| Recurring
Disaggregation of Revenue
Revenue	1,493	1,395	4,367	4,189
Banking Solutions \| Transaction processing and services \| Recurring
Disaggregation of Revenue
Revenue	1,334	1,251	3,911	3,759
Banking Solutions \| Software maintenance \| Recurring
Disaggregation of Revenue
Revenue	92	89	273	272
Banking Solutions \| Other recurring \| Recurring
Disaggregation of Revenue
Revenue	67	55	183	158
Banking Solutions \| Software license \| Non-recurring
Disaggregation of Revenue
Revenue	47	69	78	122
Banking Solutions \| Professional services \| Non-recurring
Disaggregation of Revenue
Revenue	126	153	436	451
Banking Solutions \| Other non-recurring fees \| Non-recurring
Disaggregation of Revenue
Revenue	90	86	263	277
Banking Solutions \| North America
Disaggregation of Revenue
Revenue	1,509	1,437	4,405	4,293
Banking Solutions \| All others
Disaggregation of Revenue
Revenue	247	266	739	746
Capital Market Solutions
Disaggregation of Revenue
Revenue	677	633	2,011	1,892
Capital Market Solutions \| Recurring
Disaggregation of Revenue
Revenue	505	462	1,489	1,360
Capital Market Solutions \| Transaction processing and services \| Recurring
Disaggregation of Revenue
Revenue	349	324	1,035	945
Capital Market Solutions \| Software maintenance \| Recurring
Disaggregation of Revenue
Revenue	135	123	394	372
Capital Market Solutions \| Other recurring \| Recurring
Disaggregation of Revenue
Revenue	21	15	60	43
Capital Market Solutions \| Software license \| Non-recurring
Disaggregation of Revenue
Revenue	76	66	228	212
Capital Market Solutions \| Professional services \| Non-recurring
Disaggregation of Revenue
Revenue	96	104	293	316
Capital Market Solutions \| Other non-recurring fees \| Non-recurring
Disaggregation of Revenue
Revenue	0	1	1	4
Capital Market Solutions \| North America
Disaggregation of Revenue
Revenue	413	389	1,262	1,138
Capital Market Solutions \| All others
Disaggregation of Revenue
Revenue	264	244	749	754
Corporate and Other
Disaggregation of Revenue
Revenue	56	79	156	263
Corporate and Other \| Recurring
Disaggregation of Revenue
Revenue	42	71	127	236
Corporate and Other \| Transaction processing and services \| Recurring
Disaggregation of Revenue
Revenue	31	62	95	205
Corporate and Other \| Software maintenance \| Recurring
Disaggregation of Revenue
Revenue	0	0	1	2
Corporate and Other \| Other recurring \| Recurring
Disaggregation of Revenue
Revenue	11	9	31	29
Corporate and Other \| Software license \| Non-recurring
Disaggregation of Revenue
Revenue	8	0	8	0
Corporate and Other \| Professional services \| Non-recurring
Disaggregation of Revenue
Revenue	2	2	7	6
Corporate and Other \| Other non-recurring fees \| Non-recurring
Disaggregation of Revenue
Revenue	4	6	14	21
Corporate and Other \| North America
Disaggregation of Revenue
Revenue	34	59	92	177
Corporate and Other \| All others
Disaggregation of Revenue
Revenue	$ 22	$ 20	$ 64	$ 86