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Long-Term Debt (Details) - USD ($) $ in Millions	Feb. 29, 2016	Jul. 03, 2015	Apr. 27, 2015	Jun. 27, 2014	Dec. 03, 2010	Jun. 09, 2009	Dec. 05, 2007	Feb. 01, 1998	Jan. 15, 1996
Summary of Long-term debt
Other		$ 24.0		$ 1.0
Total debt		5,168.0		1,577.0
Less: current portion of debt		130.0		1.0
Total long-term debt		5,038.0		1,576.0
Plus: unamortized bond premium		51.0
Less: unamortized discounts		3.0		4.0
Less: unamortized debt issuance costs		33.0		8.0
Total long-term debt, net		5,053.0		1,564.0
5.95% notes, due December 1, 2017
Summary of Long-term debt
Notes Payable		0.0		400.0			$ 400.0
DebtInstrumentInterestRateStatedPercentageAbstract
Interest rate on fixed rate debt							595.00%
6.375% notes, due June 15, 2019
Summary of Long-term debt
Notes Payable		0.0		350.0		$ 350.0
DebtInstrumentInterestRateStatedPercentageAbstract
Interest rate on fixed rate debt						637.50%
4.4% notes, due December 15, 2020
Summary of Long-term debt
Notes Payable		400.0		400.0	$ 400.0
DebtInstrumentInterestRateStatedPercentageAbstract
Interest rate on fixed rate debt					440.00%
7.0% debentures, due January 15, 2026
Summary of Long-term debt
Notes Payable		100.0		100.0					$ 100.0
DebtInstrumentInterestRateStatedPercentageAbstract
Interest rate on fixed rate debt									700.00%
6.35% debentures, due February 1, 2028
Summary of Long-term debt
Notes Payable		26.0		26.0				$ 150.0
DebtInstrumentInterestRateStatedPercentageAbstract
Interest rate on fixed rate debt								635.00%
6.15% notes, due December 15, 2040
Summary of Long-term debt
Notes Payable		300.0		$ 300.0	$ 300.0
DebtInstrumentInterestRateStatedPercentageAbstract
Interest rate on fixed rate debt					615.00%
4.25% notes, due October 1, 2016 (Exelis)
Summary of Long-term debt
Notes Payable	$ 250.0	250.0
DebtInstrumentInterestRateStatedPercentageAbstract
Interest rate on fixed rate debt	425.00%
5.55% notes, due October 1, 2021 (Exelis)
Summary of Long-term debt
Notes Payable	$ 400.0	400.0
DebtInstrumentInterestRateStatedPercentageAbstract
Interest rate on fixed rate debt	555.00%
1.999% notes, due April 27, 2018
Summary of Long-term debt
Notes Payable		500.0	$ 500.0
DebtInstrumentInterestRateStatedPercentageAbstract
Interest rate on fixed rate debt			199.90%
2.700% notes, due April 27, 2020
Summary of Long-term debt
Notes Payable		400.0	$ 400.0
DebtInstrumentInterestRateStatedPercentageAbstract
Interest rate on fixed rate debt			270.00%
3.832% notes, due April 27, 2025
Summary of Long-term debt
Notes Payable		600.0	$ 600.0
DebtInstrumentInterestRateStatedPercentageAbstract
Interest rate on fixed rate debt			383.20%
4.854% notes, due April 27, 2035
Summary of Long-term debt
Notes Payable		400.0	$ 400.0
DebtInstrumentInterestRateStatedPercentageAbstract
Interest rate on fixed rate debt			485.40%
5.054% notes, due April 27, 2045
Summary of Long-term debt
Notes Payable		500.0	$ 500.0
DebtInstrumentInterestRateStatedPercentageAbstract
Interest rate on fixed rate debt			505.40%
3-year tranche, due May 29, 2018
Summary of Long-term debt
Notes Payable		634.0
5-year tranche, due May 29, 2020
Summary of Long-term debt
Notes Payable		$ 634.0