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Acquisitions, Goodwill and Intangible Assets (Changes in Goodwill by Segment) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jul. 04, 2025	Jan. 03, 2025
Goodwill [Roll Forward]
Beginning balance, goodwill	$ 6,084	$ 6,112
Acquisition of a business	244
Foreign currency translation adjustments	31	(28)
Ending balance, goodwill	6,359	6,084
National Security & Digital
Goodwill [Roll Forward]
Beginning balance, goodwill	2,758	2,758
Acquisition of a business	244
Foreign currency translation adjustments	0	0
Ending balance, goodwill	3,002	2,758
Health & Civil
Goodwill [Roll Forward]
Beginning balance, goodwill	1,366	1,366
Acquisition of a business	0
Foreign currency translation adjustments	0	0
Ending balance, goodwill	1,366	1,366
Commercial & International
Goodwill [Roll Forward]
Beginning balance, goodwill	772	800
Acquisition of a business	0
Foreign currency translation adjustments	31	(28)
Ending balance, goodwill	803	772
Accumulated goodwill impairment losses	596
Defense Systems
Goodwill [Roll Forward]
Beginning balance, goodwill	1,188	1,188
Acquisition of a business	0
Foreign currency translation adjustments	0	0
Ending balance, goodwill	$ 1,188	$ 1,188

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