Significant Accounting Policies and Recent Accounting Standards (Details) $ in Millions				6 Months Ended
	May 04, 2020 USD ($)	Sep. 13, 2019 USD ($)	Jun. 29, 2019	Jul. 03, 2020 USD ($)	Jun. 28, 2019 USD ($)	May 15, 2020 USD ($)	Mar. 20, 2020 USD ($)
Business Combination, Separately Recognized Transactions [Line Items]
Cash proceeds from sale of business, after selling costs and estimated price adjustments				$ 963	$ 0
Airport Security and Automation Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Aviation Systems
Business Combination, Separately Recognized Transactions [Line Items]
Cash price on sale of business	$ 1,000
Cash proceeds from sale of business, after selling costs and estimated price adjustments	$ 951
Applied Kilovolts and Analytical Instrumentation Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Space and Airborne Systems
Business Combination, Separately Recognized Transactions [Line Items]
Cash price on sale of business						$ 12
EOTech Business | Disposal Group, Held-for-sale, Not Discontinued Operations | Communication Systems
Business Combination, Separately Recognized Transactions [Line Items]
Cash price on sale of business							$ 42
L3Harris
Business Combination, Separately Recognized Transactions [Line Items]
Exchange ratio			1.30
L3Harris | Harris Night Vision | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Combination, Separately Recognized Transactions [Line Items]
Cash proceeds from sale of business, after selling costs and estimated price adjustments		$ 343
L3Harris | Harris Night Vision | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Other non-reportable business segments
Business Combination, Separately Recognized Transactions [Line Items]
Cash price on sale of business		$ 350
L3Harris | Former Harris shareholders
Business Combination, Separately Recognized Transactions [Line Items]
Percentage of voting interests acquired			54.00%
L3Harris | Former L3 shareholders
Business Combination, Separately Recognized Transactions [Line Items]
Percentage of voting interests acquired			46.00%