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Revenue (Revenue by Geographic Destination) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 5,639	$ 4,913	$ 4,171
United States
Disaggregation of Revenue [Line Items]
Revenues	2,705	2,260
Middle East
Disaggregation of Revenue [Line Items]
Revenues	1,027	884
Europe
Disaggregation of Revenue [Line Items]
Revenues	1,058	989
Australia
Disaggregation of Revenue [Line Items]
Revenues	288	329
Canada
Disaggregation of Revenue [Line Items]
Revenues	39	21
Africa
Disaggregation of Revenue [Line Items]
Revenues	197	133
Asia
Disaggregation of Revenue [Line Items]
Revenues	214	190
Other countries
Disaggregation of Revenue [Line Items]
Revenues	111	107
Operating Segments | Government Solutions
Disaggregation of Revenue [Line Items]
Revenues	3,925	3,457	2,193
Operating Segments | Government Solutions | United States
Disaggregation of Revenue [Line Items]
Revenues	2,110	1,767
Operating Segments | Government Solutions | Middle East
Disaggregation of Revenue [Line Items]
Revenues	795	735
Operating Segments | Government Solutions | Europe
Disaggregation of Revenue [Line Items]
Revenues	796	766
Operating Segments | Government Solutions | Australia
Disaggregation of Revenue [Line Items]
Revenues	93	60
Operating Segments | Government Solutions | Canada
Disaggregation of Revenue [Line Items]
Revenues	1	1
Operating Segments | Government Solutions | Africa
Disaggregation of Revenue [Line Items]
Revenues	76	77
Operating Segments | Government Solutions | Asia
Disaggregation of Revenue [Line Items]
Revenues	0	0
Operating Segments | Government Solutions | Other countries
Disaggregation of Revenue [Line Items]
Revenues	54	51
Operating Segments | Technology Solutions
Disaggregation of Revenue [Line Items]
Revenues	374	297	269
Operating Segments | Technology Solutions | United States
Disaggregation of Revenue [Line Items]
Revenues	38	22
Operating Segments | Technology Solutions | Middle East
Disaggregation of Revenue [Line Items]
Revenues	15	14
Operating Segments | Technology Solutions | Europe
Disaggregation of Revenue [Line Items]
Revenues	71	50
Operating Segments | Technology Solutions | Australia
Disaggregation of Revenue [Line Items]
Revenues	1	1
Operating Segments | Technology Solutions | Canada
Disaggregation of Revenue [Line Items]
Revenues	1	2
Operating Segments | Technology Solutions | Africa
Disaggregation of Revenue [Line Items]
Revenues	31	25
Operating Segments | Technology Solutions | Asia
Disaggregation of Revenue [Line Items]
Revenues	211	177
Operating Segments | Technology Solutions | Other countries
Disaggregation of Revenue [Line Items]
Revenues	6	6
Operating Segments | Energy Solutions
Disaggregation of Revenue [Line Items]
Revenues	1,339	1,157	1,671
Operating Segments | Energy Solutions | United States
Disaggregation of Revenue [Line Items]
Revenues	556	469
Operating Segments | Energy Solutions | Middle East
Disaggregation of Revenue [Line Items]
Revenues	217	135
Operating Segments | Energy Solutions | Europe
Disaggregation of Revenue [Line Items]
Revenues	191	173
Operating Segments | Energy Solutions | Australia
Disaggregation of Revenue [Line Items]
Revenues	194	268
Operating Segments | Energy Solutions | Canada
Disaggregation of Revenue [Line Items]
Revenues	37	18
Operating Segments | Energy Solutions | Africa
Disaggregation of Revenue [Line Items]
Revenues	90	31
Operating Segments | Energy Solutions | Asia
Disaggregation of Revenue [Line Items]
Revenues	3	13
Operating Segments | Energy Solutions | Other countries
Disaggregation of Revenue [Line Items]
Revenues	51	50
Non-strategic Business
Disaggregation of Revenue [Line Items]
Revenues	1	2	$ 38
Non-strategic Business | United States
Disaggregation of Revenue [Line Items]
Revenues	1	2
Non-strategic Business | Middle East
Disaggregation of Revenue [Line Items]
Revenues	0	0
Non-strategic Business | Europe
Disaggregation of Revenue [Line Items]
Revenues	0	0
Non-strategic Business | Australia
Disaggregation of Revenue [Line Items]
Revenues	0	0
Non-strategic Business | Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0
Non-strategic Business | Africa
Disaggregation of Revenue [Line Items]
Revenues	0	0
Non-strategic Business | Asia
Disaggregation of Revenue [Line Items]
Revenues	0	0
Non-strategic Business | Other countries
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 0

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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