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Goodwill and Intangible Assets (Summary of Goodwill by Reportable Segments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Balance, Beginning of period	$ 1,265	$ 968
Goodwill acquired during the period	0	299
Purchase price adjustment	0	2
Foreign currency translation	0	(4)
Balance, End of period	1,265	1,265
Government Solutions
Goodwill [Roll Forward]
Balance, Beginning of period	977	679
Goodwill acquired during the period	0	299
Purchase price adjustment	0	2
Foreign currency translation	1	(3)
Balance, End of period	978	977
Technology
Goodwill [Roll Forward]
Balance, Beginning of period	51	51
Goodwill acquired during the period		0
Purchase price adjustment	0	0
Foreign currency translation	(1)	0
Balance, End of period	50	51
Energy Solutions
Goodwill [Roll Forward]
Balance, Beginning of period	237	238
Goodwill acquired during the period	0	0
Purchase price adjustment	0	0
Foreign currency translation	0	(1)
Balance, End of period	$ 237	$ 237

X

- Definition

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.

+ References

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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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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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