Business Divestitures and Assets Sales (Details) - USD ($)						3 Months Ended				6 Months Ended	9 Months Ended
	Jul. 31, 2020	May 15, 2020	May 04, 2020	Sep. 13, 2019	Aug. 30, 2019	Oct. 02, 2020	Jul. 03, 2020	Apr. 03, 2020	Sep. 27, 2019	Jul. 03, 2020	Oct. 02, 2020	Sep. 27, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash proceeds from sale of business, after selling costs and estimated price adjustments											$ 1,002,000,000	$ 346,000,000
Pre-tax gain (loss) on sale of disposal group											0	12,000,000
Non-cash goodwill impairment charge									$ 0		369,000,000
Proceeds from sale of asset group											0	$ 20,000,000
Space and Airborne Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash goodwill impairment charge											5,000,000
Aviation Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash goodwill impairment charge											364,000,000
Communication Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash goodwill impairment charge											0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | EOTech Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash price on sale of business	$ 42,000,000
Net cash proceeds from sale of business, after selling costs and estimated price adjustments	40,000,000
Pre-tax gain (loss) on sale of disposal group	$ 2,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | EOTech Business | Communication Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash goodwill impairment charge								$ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Applied Kilovolts and Analytical Instrumentation Business | Space and Airborne Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash proceeds from sale of business, after selling costs and estimated price adjustments		$ 12,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Applied Kilovolts and Analytical Instrumentation Business | Space and Airborne Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash goodwill impairment charge								5,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Airport Security and Automation Business | Aviation Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash price on sale of business			$ 1,000,000,000
Net cash proceeds from sale of business, after selling costs and estimated price adjustments			$ 950,000,000
Pre-tax gain (loss) on sale of disposal group							$ (26,000,000)
Adjustment related to selling costs that increase loss on sale of disposal group initially recognized						$ 2,000,000
Goodwill assigned to disposal group								531,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Airport Security and Automation Business | Aviation Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash goodwill impairment charge								$ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Harris Night Vision | L3Harris
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash proceeds from sale of business, after selling costs and estimated price adjustments				$ 343,000,000
Pre-tax gain (loss) on sale of disposal group				229,000,000
Non-cash working capital adjustment to gain on sale of business							12,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Harris Night Vision | L3Harris | Other non-reportable business segments
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash price on sale of business				$ 350,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Stormscope
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of asset group					$ 20,000,000
Pre-tax gain on sale of asset group					$ 12,000,000
Disposal Group, Held-for-sale, Not Discontinued Operations | Other AS Disposal Groups | Aviation Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill assigned to disposal group							14,000,000			$ 14,000,000
Assets of disposal group held for sale						34,000,000					34,000,000
Liabilities of disposal group held for sale						15,000,000					$ 15,000,000
Disposal Group, Held-for-sale, Not Discontinued Operations | Other AS Disposal Groups | Aviation Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash goodwill impairment charge							14,000,000			$ 14,000,000
Loss recognized to reduce fair value of assets of disposal group							28,000,000
Non-cash remeasurement loss recognized on remaining assets of disposal group						$ 10,000,000	$ 14,000,000