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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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- Definition

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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