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Revenue - Disaggregated 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 [Line Items]
Revenue	$ 1,041	$ 1,098	$ 3,108	$ 3,368
Point in time
Disaggregation of Revenue [Line Items]
Revenue	23	38	85	111
Over time
Disaggregation of Revenue [Line Items]
Revenue	1,018	1,060	3,023	3,257
Commercial Industries
Disaggregation of Revenue [Line Items]
Revenue	518	578	1,610	1,782
Commercial Industries | Customer Experience Management
Disaggregation of Revenue [Line Items]
Revenue	149	161	474	490
Commercial Industries | Business Operations Solutions
Disaggregation of Revenue [Line Items]
Revenue	140	153	426	476
Commercial Industries | Commercial Healthcare Solutions
Disaggregation of Revenue [Line Items]
Revenue	106	121	322	366
Commercial Industries | Human Resource Services
Disaggregation of Revenue [Line Items]
Revenue	123	143	388	450
Government services
Disaggregation of Revenue [Line Items]
Revenue	348	319	969	970
Government services | Government Healthcare Solutions
Disaggregation of Revenue [Line Items]
Revenue	153	171	459	523
Government services | Government Services Solutions
Disaggregation of Revenue [Line Items]
Revenue	195	148	510	447
Transportation Services
Disaggregation of Revenue [Line Items]
Revenue	175	201	529	579
Transportation Services | Roadway Charging & Management Services
Disaggregation of Revenue [Line Items]
Revenue	83	83	232	243
Transportation Services | Transit Solutions
Disaggregation of Revenue [Line Items]
Revenue	53	69	181	185
Transportation Services | Curbside Management Solutions
Disaggregation of Revenue [Line Items]
Revenue	18	27	54	82
Transportation Services | Public Safety Solutions
Disaggregation of Revenue [Line Items]
Revenue	19	20	56	61
Transportation Services | Commercial Vehicles
Disaggregation of Revenue [Line Items]
Revenue	2	2	6	8
Other
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	37
Other | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	36
Other | Education
Disaggregation of Revenue [Line Items]
Revenue	$ 0	$ 0	$ 0	$ 1

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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