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Revenue (Schedule of Revenue by Contract Type) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 02, 2026	Jan. 03, 2025	Dec. 29, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 7,786	$ 7,710	$ 6,956
Cost-Reimbursable
Disaggregation of Revenue [Line Items]
Revenues	3,305	3,507	3,287
Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues	2,311	2,254	2,012
Fixed Price
Disaggregation of Revenue [Line Items]
Revenues	2,170	1,949	1,657
MTS
Disaggregation of Revenue [Line Items]
Revenues	5,581	5,555	5,119
MTS | Cost-Reimbursable
Disaggregation of Revenue [Line Items]
Revenues	3,305	3,507	3,287
MTS | Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues	938	892	846
MTS | Fixed Price
Disaggregation of Revenue [Line Items]
Revenues	1,338	1,156	986
STS
Disaggregation of Revenue [Line Items]
Revenues	2,205	2,155	1,837
STS | Cost-Reimbursable
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
STS | Time-and-Materials
Disaggregation of Revenue [Line Items]
Revenues	1,373	1,362	1,166
STS | Fixed Price
Disaggregation of Revenue [Line Items]
Revenues	$ 832	$ 793	$ 671

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