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Business Divestitures and Asset Sales - Additional Information (Details) - USD ($)				3 Months Ended
	Mar. 20, 2020	Jan. 31, 2020	Sep. 13, 2019	Apr. 03, 2020	Sep. 27, 2019	Mar. 29, 2019	Feb. 04, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of goodwill				$ 301,000,000	$ 0
Aviation Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of goodwill				296,000,000
Communication Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of goodwill				0
Space and Airborne Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of goodwill				5,000,000
Discontinued Operations, Held-for-sale \| Airport Security and Automation Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill assigned to disposal group				588,000,000
Income before taxes of disposal group				12,000,000
Assets of disposal group held for sale				1,146,000,000
Liabilities of disposal group held for sale				195,000,000
Discontinued Operations, Held-for-sale \| 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
Goodwill assigned to disposal group				588,000,000
Impairment of goodwill		$ 0
Discontinued Operations, Held-for-sale \| EOTech Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill assigned to disposal group				9,000,000
Assets of disposal group held for sale				48,000,000
Liabilities of disposal group held for sale				8,000,000
Discontinued Operations, Held-for-sale \| EOTech Business \| Communication Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash price on sale of business	$ 42,000,000
Goodwill assigned to disposal group				9,000,000
Impairment of goodwill	$ 0
Discontinued Operations, Held-for-sale \| 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]
Goodwill assigned to disposal group				2,000,000
Impairment of goodwill				5,000,000
Assets of disposal group held for sale				14,000,000
Liabilities of disposal group held for sale				$ 1,000,000
Discontinued operations, Disposed of by Sale \| Harris Night Vision \| L3Harris
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income before taxes of disposal group						$ 6,000,000
Cash proceeds from sale of business, after selling costs and estimated price adjustments			$ 346,000,000
Gain (loss) on disposal of discontinued operations			$ 229,000,000