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Revenue (Revenue by Contract Type) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total net revenue	$ 1,536	$ 1,385	$ 2,997	$ 2,922
Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total net revenue	728	570	1,417	1,153
Time-and-Materials
Disaggregation of Revenue [Line Items]
Total net revenue	413	437	815	965
Fixed Price
Disaggregation of Revenue [Line Items]
Total net revenue	395	378	765	804
Government Solutions
Disaggregation of Revenue [Line Items]
Total net revenue	1,231	953	2,395	1,935
Government Solutions | Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total net revenue	728	570	1,417	1,153
Government Solutions | Time-and-Materials
Disaggregation of Revenue [Line Items]
Total net revenue	226	140	438	264
Government Solutions | Fixed Price
Disaggregation of Revenue [Line Items]
Total net revenue	277	243	540	518
Sustainable Technology Solutions
Disaggregation of Revenue [Line Items]
Total net revenue	305	432	602	987
Sustainable Technology Solutions | Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total net revenue	0	0	0	0
Sustainable Technology Solutions | Time-and-Materials
Disaggregation of Revenue [Line Items]
Total net revenue	187	297	377	701
Sustainable Technology Solutions | Fixed Price
Disaggregation of Revenue [Line Items]
Total net revenue	$ 118	$ 135	$ 225	$ 286

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