Acquisitions (Schedule of intangible assets acquired) (Details) - USD ($) $ in Millions	May 04, 2020	Jan. 31, 2020
L3Harris Security Detection and Automation Businesses
Acquired Indefinite-lived Intangible Assets [Line Items]
Weighted average amortization period	8 years
Intangible assets	$ 280
Dynetics
Acquired Indefinite-lived Intangible Assets [Line Items]
Weighted average amortization period		14 years
Intangible assets		$ 544
Programs | L3Harris Security Detection and Automation Businesses
Acquired Indefinite-lived Intangible Assets [Line Items]
Weighted average amortization period	7 years
Intangible assets	$ 117
Programs | Dynetics
Acquired Indefinite-lived Intangible Assets [Line Items]
Weighted average amortization period		15 years
Intangible assets		$ 500
Backlog | Dynetics
Acquired Indefinite-lived Intangible Assets [Line Items]
Weighted average amortization period		1 year
Intangible assets		$ 33
Software and technology | L3Harris Security Detection and Automation Businesses
Acquired Indefinite-lived Intangible Assets [Line Items]
Weighted average amortization period	10 years
Intangible assets	$ 140
Software and technology | Dynetics
Acquired Indefinite-lived Intangible Assets [Line Items]
Weighted average amortization period		11 years
Intangible assets		$ 11
Trade names | L3Harris Security Detection and Automation Businesses
Acquired Indefinite-lived Intangible Assets [Line Items]
Weighted average amortization period	5 years
Intangible assets	$ 23