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Goodwill and Intangible Assets, Net - Goodwill (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |  |  |  |
Beginning Balance, Goodwill |  |  | $ 3,366,000,000 | $ 3,889,000,000 |
Foreign currency translation |  |  | (26,000,000) | 47,000,000 |
Goodwill, disposal during year |  |  |  | (33,000,000) |
Goodwill, Impairment Loss | $ 0 |  | 0 | 0 | $ (935,000,000)
Ending Balance, Goodwill | 3,366,000,000 | $ 3,889,000,000 | 3,408,000,000 | 3,366,000,000 | 3,889,000,000
Commercial Industries segment [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Beginning Balance, Goodwill |  |  | 1,399,000,000 | 1,504,000,000 |
Foreign currency translation |  |  | (10,000,000) | 19,000,000 |
Goodwill, disposal during year |  |  |  | (19,000,000) |
Goodwill, Impairment Loss |  | (935,000,000) |  |  |
Ending Balance, Goodwill | 1,399,000,000 | 1,504,000,000 | 1,391,000,000 | 1,399,000,000 | 1,504,000,000
Government services [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Beginning Balance, Goodwill |  |  | 1,310,000,000 | 1,738,000,000 |
Foreign currency translation |  |  | 0 | 0 |
Goodwill, disposal during year |  |  |  | (14,000,000) |
Ending Balance, Goodwill | 1,310,000,000 | 1,738,000,000 | 1,376,000,000 | 1,310,000,000 | 1,738,000,000
Public Sector [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Impairment Loss |  | 0 |  |  |
Transportation Services [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Beginning Balance, Goodwill |  |  | 657,000,000 | 647,000,000 |
Foreign currency translation |  |  | (16,000,000) | 28,000,000 |
Goodwill, disposal during year |  |  |  | 0 |
Ending Balance, Goodwill | $ 657,000,000 | $ 647,000,000 | 641,000,000 | 657,000,000 | $ 647,000,000
Held-for-sale |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill held for sale |  |  | (12,000,000) | (537,000,000) |
Goodwill, Other Increase (Decrease) |  |  | 80,000,000 |  |
Held-for-sale | Commercial Industries segment [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill held for sale |  |  | (12,000,000) | (105,000,000) |
Goodwill, Other Increase (Decrease) |  |  | 14,000,000 |  |
Held-for-sale | Government services [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill held for sale |  |  | 0 | (414,000,000) |
Goodwill, Other Increase (Decrease) |  |  | 66,000,000 |  |
Held-for-sale | Transportation Services [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill held for sale |  |  | 0 | $ (18,000,000) |
Goodwill, Other Increase (Decrease) |  |  | $ 0 |  |

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