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Revenue - Disaggregated Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 1,026	$ 1,016	$ 2,054	$ 2,067
Point in time
Disaggregation of Revenue [Line Items]
Revenue	25	32	57	62
Over time
Disaggregation of Revenue [Line Items]
Revenue	1,001	984	1,997	2,005
Commercial Industries:
Disaggregation of Revenue [Line Items]
Revenue	503	520	1,029	1,092
Commercial Industries: | Customer experience management
Disaggregation of Revenue [Line Items]
Revenue	146	157	307	325
Commercial Industries: | Business operations solutions
Disaggregation of Revenue [Line Items]
Revenue	137	133	279	286
Commercial Industries: | Commercial healthcare solutions
Disaggregation of Revenue [Line Items]
Revenue	109	103	220	216
Commercial Industries: | Human resource and learning services
Disaggregation of Revenue [Line Items]
Revenue	111	127	223	265
Government Services:
Disaggregation of Revenue [Line Items]
Revenue	338	331	656	621
Government Services: | Government healthcare solutions
Disaggregation of Revenue [Line Items]
Revenue	140	154	289	306
Government Services: | Government services solutions
Disaggregation of Revenue [Line Items]
Revenue	198	177	367	315
Transportation:
Disaggregation of Revenue [Line Items]
Revenue	185	165	369	354
Transportation: | Roadway charging & management services
Disaggregation of Revenue [Line Items]
Revenue	75	71	158	149
Transportation: | Transit solutions
Disaggregation of Revenue [Line Items]
Revenue	70	61	134	128
Transportation: | Curbside management solutions
Disaggregation of Revenue [Line Items]
Revenue	20	14	38	36
Transportation: | Public safety solutions
Disaggregation of Revenue [Line Items]
Revenue	18	17	35	37
Transportation: | Commercial vehicles
Disaggregation of Revenue [Line Items]
Revenue	$ 2	$ 2	$ 4	$ 4

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