Long-Term Debt (Details)	Apr. 01, 2016 USD ($)
4.25% notes, due October 1, 2016 (Exelis) | Financial guarantee by Harris Corporation (terminated on Dec 31, 2015)
Guarantor Obligations [Line Items]
Notes Payable	$ 250,000,000
Interest rate on fixed rate debt	4.25%
5.55% notes, due October 1, 2021 (Exelis) | Financial guarantee by Harris Corporation (terminated on Dec 31, 2015)
Guarantor Obligations [Line Items]
Notes Payable	$ 400,000,000
Interest rate on fixed rate debt	5.55%
Fixed rate debt securities | Financial guarantee by Exelis Inc. (terminated on Dec 31, 2015)
Guarantor Obligations [Line Items]
Notes Payable	$ 3,226,000,000