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Contract Assets and Contract Liabilities (Contract Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Contract assets	$ 215	$ 185
Operating Segments | Government Solutions
Disaggregation of Revenue [Line Items]
Contract assets	111	123
Operating Segments | Technology Solutions
Disaggregation of Revenue [Line Items]
Contract assets	36	19
Operating Segments | Energy Solutions
Disaggregation of Revenue [Line Items]
Contract assets	68	43
Subtotal
Disaggregation of Revenue [Line Items]
Contract assets	215	185
Non-strategic Business
Disaggregation of Revenue [Line Items]
Contract assets	$ 0	$ 0

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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