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Revenue (Revenue by Customer Type) (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
MTS
Disaggregation of Revenue [Line Items]
Revenues	1,406	1,406	4,286	4,047
STS
Disaggregation of Revenue [Line Items]
Revenues	525	531	1,615	1,555
U.S. Government Defense and Intelligence Clients
Disaggregation of Revenue [Line Items]
Revenues	832	835	2,594	2,362
U.S. Government Defense and Intelligence Clients | MTS
Disaggregation of Revenue [Line Items]
Revenues	832	835	2,594	2,362
U.S. Government Defense and Intelligence Clients | STS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
U.S. Government Federal Civilian Clients
Disaggregation of Revenue [Line Items]
Revenues	274	288	828	836
U.S. Government Federal Civilian Clients | MTS
Disaggregation of Revenue [Line Items]
Revenues	274	288	828	836
U.S. Government Federal Civilian Clients | STS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
International Government Clients
Disaggregation of Revenue [Line Items]
Revenues	236	220	678	660
International Government Clients | MTS
Disaggregation of Revenue [Line Items]
Revenues	236	220	678	660
International Government Clients | STS
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Commercial and Infrastructure Clients
Disaggregation of Revenue [Line Items]
Revenues	589	594	1,801	1,744
Commercial and Infrastructure Clients | MTS
Disaggregation of Revenue [Line Items]
Revenues	64	63	186	189
Commercial and Infrastructure Clients | STS
Disaggregation of Revenue [Line Items]
Revenues	$ 525	$ 531	$ 1,615	$ 1,555

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