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Revenue (Revenue by Business Unit and Reportable Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 03, 2025	Sep. 27, 2024	Oct. 03, 2025	Sep. 27, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 1,931	$ 1,937	$ 5,901	$ 5,602
Mission Technology Solutions
Disaggregation of Revenue [Line Items]
Revenues	1,406	1,406	4,286	4,047
Sustainable Technology Solutions
Disaggregation of Revenue [Line Items]
Revenues	525	531	1,615	1,555
Science & Space | Mission Technology Solutions
Disaggregation of Revenue [Line Items]
Revenues	292	308	877	897
Defense & Intel | Mission Technology Solutions
Disaggregation of Revenue [Line Items]
Revenues	814	712	2,418	2,034
Readiness & Sustainment | Mission Technology Solutions
Disaggregation of Revenue [Line Items]
Revenues	$ 300	$ 386	$ 991	$ 1,116

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