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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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