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Revenue (Revenue by Contract 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]
Total revenue	$ 1,931	$ 1,937	$ 5,901	$ 5,602
Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total revenue	823	898	2,567	2,581
Time-and-Materials
Disaggregation of Revenue [Line Items]
Total revenue	573	563	1,779	1,624
Fixed Price
Disaggregation of Revenue [Line Items]
Total revenue	535	476	1,555	1,397
MTS
Disaggregation of Revenue [Line Items]
Total revenue	1,406	1,406	4,286	4,047
MTS | Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total revenue	823	898	2,567	2,581
MTS | Time-and-Materials
Disaggregation of Revenue [Line Items]
Total revenue	238	226	725	634
MTS | Fixed Price
Disaggregation of Revenue [Line Items]
Total revenue	345	282	994	832
STS
Disaggregation of Revenue [Line Items]
Total revenue	525	531	1,615	1,555
STS | Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
STS | Time-and-Materials
Disaggregation of Revenue [Line Items]
Total revenue	335	337	1,054	990
STS | Fixed Price
Disaggregation of Revenue [Line Items]
Total revenue	$ 190	$ 194	$ 561	$ 565

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