Goodwill and Intangible Assets (Cost and Accumulated Amortization of Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	$ 679	$ 667
Accumulated Amortization	(184)	(151)
Intangible Assets, Net	$ 495	$ 516
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Lives	16 years	17 years
Intangible Assets, Gross	$ 271	$ 272
Accumulated Amortization	(83)	(69)
Intangible Assets, Net	$ 188	$ 203
Developed technologies
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Lives	22 years	22 years
Intangible Assets, Gross	$ 68	$ 61
Accumulated Amortization	(36)	(34)
Intangible Assets, Net	$ 32	$ 27
Contract backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Lives	19 years	20 years
Intangible Assets, Gross	$ 255	$ 249
Accumulated Amortization	(52)	(36)
Intangible Assets, Net	$ 203	$ 213
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Lives	14 years	14 years
Intangible Assets, Gross	$ 24	$ 24
Accumulated Amortization	(13)	(12)
Intangible Assets, Net	11	12
Trademarks/trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	61	61
Intangible Assets, Net	$ 61	$ 61