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Goodwill and Other Intangible Assets - Goodwill by Business Segment (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Apr. 02, 2021	Apr. 03, 2020	Jan. 01, 2021
Changes in the carrying amount of goodwill
Beginning Balance	$ 18,876	$ 20,001	$ 20,001
Goodwill decrease from divestitures	(538)	(599)
Impairment of goodwill	(62)	(301)
Currency translation adjustments	(24)	(24)
Other (including adjustments to previously estimated fair value of assets acquired and liabilities assumed)		188
Ending Balance	18,252	19,265	18,876
Disposal Group, Held-for-sale, Not Discontinued Operations
Changes in the carrying amount of goodwill
Goodwill decrease from divestitures	(538)	(599)
Integrated Mission Systems
Changes in the carrying amount of goodwill
Beginning Balance	6,499	5,768	5,768
Goodwill decrease from divestitures	0	0
Impairment of goodwill	0	0
Currency translation adjustments	(5)	(2)
Other (including adjustments to previously estimated fair value of assets acquired and liabilities assumed)		22
Ending Balance	6,494	5,788	6,499
Space and Airborne Systems
Changes in the carrying amount of goodwill
Beginning Balance	5,232	5,131	5,131
Goodwill decrease from divestitures	0	(2)
Impairment of goodwill	0	(5)
Currency translation adjustments	(14)	(9)
Other (including adjustments to previously estimated fair value of assets acquired and liabilities assumed)		55
Ending Balance	5,218	5,170	5,232
Communication Systems
Changes in the carrying amount of goodwill
Beginning Balance	4,153	4,243	4,243
Goodwill decrease from divestitures	0	(9)
Impairment of goodwill	0	0
Currency translation adjustments	0	(3)
Other (including adjustments to previously estimated fair value of assets acquired and liabilities assumed)		38
Ending Balance	4,153	4,269	4,153
Aviation Systems
Changes in the carrying amount of goodwill
Beginning Balance	2,992	4,859	4,859
Goodwill decrease from divestitures	(538)	(588)
Impairment of goodwill	(62)	(296)
Currency translation adjustments	(5)	(10)
Other (including adjustments to previously estimated fair value of assets acquired and liabilities assumed)		73
Ending Balance	$ 2,387	$ 4,038	$ 2,992

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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