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Revenue (Revenue by Contract Type) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 04, 2025	Jun. 28, 2024	Jul. 04, 2025	Jun. 28, 2024
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,952	$ 1,847	$ 3,970	$ 3,665
Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total revenue	853	839	1,744	1,683
Time-and-Materials
Disaggregation of Revenue [Line Items]
Total revenue	615	553	1,206	1,061
Fixed Price
Disaggregation of Revenue [Line Items]
Total revenue	484	455	1,020	921
Mission Technology Solutions
Disaggregation of Revenue [Line Items]
Total revenue	1,412	1,316	2,880	2,641
Mission Technology Solutions | Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total revenue	853	839	1,744	1,683
Mission Technology Solutions | Time-and-Materials
Disaggregation of Revenue [Line Items]
Total revenue	236	209	487	408
Mission Technology Solutions | Fixed Price
Disaggregation of Revenue [Line Items]
Total revenue	323	268	649	550
Sustainable Technology Solutions
Disaggregation of Revenue [Line Items]
Total revenue	540	531	1,090	1,024
Sustainable Technology Solutions | Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Sustainable Technology Solutions | Time-and-Materials
Disaggregation of Revenue [Line Items]
Total revenue	379	344	719	653
Sustainable Technology Solutions | Fixed Price
Disaggregation of Revenue [Line Items]
Total revenue	$ 161	$ 187	$ 371	$ 371

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