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Segment Reporting - Segment Revenue and Segment Profit (Loss) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) primaryreportablesegment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |
Reportable segments, number | primaryreportablesegment | 3 |  |
Total Revenues | $ 5,393 | $ 6,022 | $ 6,408
Revenue from Contract with Customer, Excluding Assessed Tax | 5,393 |  |
Depreciation and Amortization, excluding Amortization of Acquired Intangible Assets | 221 | 254 | 333
Segment Adjusted EBITDA | 640 | 672 | 635
Segment profit (loss) | 422 | 417 | 196
Commercial Industries [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 2,547 | 2,685 | 2,827
Revenue from Contract with Customer, Excluding Assessed Tax | 2,547 |  |
Depreciation and Amortization, excluding Amortization of Acquired Intangible Assets | 97 | 98 | 103
Segment Adjusted EBITDA | 597 | 661 | 623
Segment profit (loss) | 500 | 563 | 520
Government services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 1,351 | 1,433 | 1,575
Depreciation and Amortization, excluding Amortization of Acquired Intangible Assets | 30 | 41 | 43
Segment Adjusted EBITDA | 451 | 440 | 464
Segment profit (loss) | 424 | 398 | 421
Transportation Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 729 | 767 | 766
Depreciation and Amortization, excluding Amortization of Acquired Intangible Assets | 36 | 43 | 41
Segment Adjusted EBITDA | 149 | 157 | 129
Segment profit (loss) | 113 | 114 | 88
Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 766 |  |
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 0 | 0 | 0
Depreciation and Amortization, excluding Amortization of Acquired Intangible Assets | 48 | 57 | 70
Segment Adjusted EBITDA | (647) | (745) | (780)
Segment profit (loss) | (695) | (802) | (850)
Disposed of by Sale | Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 752 | 1,062 | 1,109
Depreciation and Amortization, excluding Amortization of Acquired Intangible Assets | 7 | 13 | 24
Segment Adjusted EBITDA | 105 | 141 | 190
Segment profit (loss) | 98 | 128 | 166
Education [Member] | Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 14 | 75 | 131
Depreciation and Amortization, excluding Amortization of Acquired Intangible Assets | 3 | 2 | 52
Segment Adjusted EBITDA | (15) | 18 | 9
Segment profit (loss) | $ (18) | $ 16 | $ (149)

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