Revenue - Disaggregate Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue
Revenue	$ 3,197	$ 2,822	$ 9,236	$ 6,991
Recurring
Disaggregation of Revenue
Revenue	2,790	2,372	7,976	5,710
Transaction processing and services \| Recurring
Disaggregation of Revenue
Revenue	2,488	2,077	7,078	4,852
Software maintenance \| Recurring
Disaggregation of Revenue
Revenue	213	213	634	633
Other recurring \| Recurring
Disaggregation of Revenue
Revenue	89	82	264	225
Software license \| Non-recurring
Disaggregation of Revenue
Revenue	79	136	256	333
Professional services \| Non-recurring
Disaggregation of Revenue
Revenue	262	251	759	742
Other non-recurring fees \| Non-recurring
Disaggregation of Revenue
Revenue	66	63	245	206
North America
Disaggregation of Revenue
Revenue	2,445	2,143	7,086	5,375
All others
Disaggregation of Revenue
Revenue	752	679	2,150	1,616
Corporate and other
Disaggregation of Revenue
Revenue	47	63	139	188
Corporate and other \| Recurring
Disaggregation of Revenue
Revenue	41	57	126	169
Corporate and other \| Transaction processing and services \| Recurring
Disaggregation of Revenue
Revenue	41	57	125	169
Corporate and other \| Software maintenance \| Recurring
Disaggregation of Revenue
Revenue	0	0	1	0
Corporate and other \| Other recurring \| Recurring
Disaggregation of Revenue
Revenue	0	0	0	0
Corporate and other \| Software license \| Non-recurring
Disaggregation of Revenue
Revenue	0	0	0	0
Corporate and other \| Professional services \| Non-recurring
Disaggregation of Revenue
Revenue	1	1	3	4
Corporate and other \| Other non-recurring fees \| Non-recurring
Disaggregation of Revenue
Revenue	5	5	10	15
Corporate and other \| North America
Disaggregation of Revenue
Revenue	35	48	110	143
Corporate and other \| All others
Disaggregation of Revenue
Revenue	12	15	29	45
Operating segments \| Merchant solutions
Disaggregation of Revenue
Revenue	1,017	705	2,764	852
Operating segments \| Merchant solutions \| Recurring
Disaggregation of Revenue
Revenue	1,016	702	2,757	842
Operating segments \| Merchant solutions \| Transaction processing and services \| Recurring
Disaggregation of Revenue
Revenue	996	690	2,697	829
Operating segments \| Merchant solutions \| Software maintenance \| Recurring
Disaggregation of Revenue
Revenue	1	1	2	1
Operating segments \| Merchant solutions \| Other recurring \| Recurring
Disaggregation of Revenue
Revenue	19	11	58	12
Operating segments \| Merchant solutions \| Software license \| Non-recurring
Disaggregation of Revenue
Revenue	0	1	2	7
Operating segments \| Merchant solutions \| Professional services \| Non-recurring
Disaggregation of Revenue
Revenue	0	0	1	0
Operating segments \| Merchant solutions \| Other non-recurring fees \| Non-recurring
Disaggregation of Revenue
Revenue	1	2	4	3
Operating segments \| Merchant solutions \| North America
Disaggregation of Revenue
Revenue	747	501	2,011	648
Operating segments \| Merchant solutions \| All others
Disaggregation of Revenue
Revenue	270	204	753	204
Operating segments \| Banking solutions
Disaggregation of Revenue
Revenue	1,507	1,443	4,447	4,173
Operating segments \| Banking solutions \| Recurring
Disaggregation of Revenue
Revenue	1,279	1,187	3,728	3,434
Operating segments \| Banking solutions \| Transaction processing and services \| Recurring
Disaggregation of Revenue
Revenue	1,146	1,052	3,334	3,030
Operating segments \| Banking solutions \| Software maintenance \| Recurring
Disaggregation of Revenue
Revenue	88	91	263	271
Operating segments \| Banking solutions \| Other recurring \| Recurring
Disaggregation of Revenue
Revenue	45	44	131	133
Operating segments \| Banking solutions \| Software license \| Non-recurring
Disaggregation of Revenue
Revenue	15	53	48	112
Operating segments \| Banking solutions \| Professional services \| Non-recurring
Disaggregation of Revenue
Revenue	153	147	441	439
Operating segments \| Banking solutions \| Other non-recurring fees \| Non-recurring
Disaggregation of Revenue
Revenue	60	56	230	188
Operating segments \| Banking solutions \| North America
Disaggregation of Revenue
Revenue	1,281	1,216	3,789	3,472
Operating segments \| Banking solutions \| All others
Disaggregation of Revenue
Revenue	226	227	658	701
Operating segments \| Capital market solutions
Disaggregation of Revenue
Revenue	626	611	1,886	1,778
Operating segments \| Capital market solutions \| Recurring
Disaggregation of Revenue
Revenue	454	426	1,365	1,265
Operating segments \| Capital market solutions \| Transaction processing and services \| Recurring
Disaggregation of Revenue
Revenue	305	278	922	824
Operating segments \| Capital market solutions \| Software maintenance \| Recurring
Disaggregation of Revenue
Revenue	124	121	368	361
Operating segments \| Capital market solutions \| Other recurring \| Recurring
Disaggregation of Revenue
Revenue	25	27	75	80
Operating segments \| Capital market solutions \| Software license \| Non-recurring
Disaggregation of Revenue
Revenue	64	82	206	214
Operating segments \| Capital market solutions \| Professional services \| Non-recurring
Disaggregation of Revenue
Revenue	108	103	314	299
Operating segments \| Capital market solutions \| Other non-recurring fees \| Non-recurring
Disaggregation of Revenue
Revenue	0	0	1	0
Operating segments \| Capital market solutions \| North America
Disaggregation of Revenue
Revenue	382	378	1,176	1,112
Operating segments \| Capital market solutions \| All others
Disaggregation of Revenue
Revenue	$ 244	$ 233	$ 710	$ 666