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Revenue, Contract Assets and Liabilities - Disaggregated Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 1,158	$ 1,420
Point in time
Disaggregation of Revenue [Line Items]
Revenue	39	36
Over time
Disaggregation of Revenue [Line Items]
Revenue	1,119	1,384
Commercial Industries
Disaggregation of Revenue [Line Items]
Revenue	612	654
Commercial Industries | Omni-Channel Communications
Disaggregation of Revenue [Line Items]
Revenue	211	219
Commercial Industries | Human Resource Services
Disaggregation of Revenue [Line Items]
Revenue	182	187
Commercial Industries | industry Services
Disaggregation of Revenue [Line Items]
Revenue	219	248
Government services
Disaggregation of Revenue [Line Items]
Revenue	325	335
Government services | Government Services and Health
Disaggregation of Revenue [Line Items]
Revenue	119	114
Government services | Payment Services
Disaggregation of Revenue [Line Items]
Revenue	74	82
Government services | State and Local
Disaggregation of Revenue [Line Items]
Revenue	119	126
Government services | Federal
Disaggregation of Revenue [Line Items]
Revenue	13	13
Transportation Services
Disaggregation of Revenue [Line Items]
Revenue	184	176
Transportation Services | Tolling
Disaggregation of Revenue [Line Items]
Revenue	79	72
Transportation Services | Transit
Disaggregation of Revenue [Line Items]
Revenue	54	54
Transportation Services | Photo and Parking
Disaggregation of Revenue [Line Items]
Revenue	48	46
Transportation Services | Commercial Vehicle
Disaggregation of Revenue [Line Items]
Revenue	3	4
Other
Disaggregation of Revenue [Line Items]
Revenue	37	255
Other | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Disaggregation of Revenue [Line Items]
Revenue	36	248
Other | Education
Disaggregation of Revenue [Line Items]
Revenue	$ 1	$ 7

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+ References

No definition available.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Topic 606
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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