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Goodwill and Intangible Assets (Changes in Goodwill by Segment) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 28, 2024	Dec. 29, 2023
Goodwill [Roll Forward]
Beginning balance, goodwill	$ 6,112	$ 6,696
Goodwill Impairment		(596)
Acquisitions of a business		(4)
Foreign currency translation adjustments	(10)	16
Ending balance, goodwill	6,102	6,112
National Security and Digital
Goodwill [Roll Forward]
Beginning balance, goodwill	2,758	2,755
Goodwill Impairment		0
Acquisitions of a business		0
Foreign currency translation adjustments	0	3
Ending balance, goodwill	2,758	2,758
Health & Civil
Goodwill [Roll Forward]
Beginning balance, goodwill	1,366	1,366
Goodwill Impairment		0
Acquisitions 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	800	1,389
Goodwill Impairment		(596)
Acquisitions of a business		(4)
Foreign currency translation adjustments	(10)	11
Ending balance, goodwill	790	800
Accumulated goodwill impairment losses		596
Defense Systems
Goodwill [Roll Forward]
Beginning balance, goodwill	1,188	1,186
Goodwill Impairment		0
Acquisitions of a business		0
Foreign currency translation adjustments	0	2
Ending balance, goodwill	$ 1,188	$ 1,188

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