Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Restructuring and Other Exit Costs - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jul. 03, 2020	Jul. 03, 2020	Jan. 03, 2020	Jun. 28, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 22
Restructuring liabilities	$ 48	48	$ 65
COVID-19-Related Restructuring Costs
Restructuring Cost and Reserve [Line Items]
Restructuring liabilities	12	12
COVID-19-Related Restructuring Costs \| Aviation Systems
Restructuring Cost and Reserve [Line Items]
Restructuring charges	11	14
COVID-19-Related Restructuring Costs \| Communication Systems
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1	1
Facilities consolidation and other exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0
Restructuring liabilities	6	6	$ 7
Remaining lease term (less than)				3 years
L3Harris
Restructuring Cost and Reserve [Line Items]
Restructuring charges	7	7
Restructuring liabilities	$ 30	$ 30