Condensed Consolidating Financial Statements (Details 2) - USD ($) $ in Millions	Jul. 03, 2015	Jun. 27, 2014	Jun. 28, 2013	Jun. 29, 2012
Current Assets
Cash and cash equivalents	$ 481.0	$ 561.0	$ 321.0	$ 356.0
Receivables	1,168.0	566.0
Inventories	1,015.0	619.0
Income taxes receivable	87.0	28.0
Current deferred income taxes	341.0	112.0
Deferred compensation plan investments	267.0	9.0
Other current assets	165.0	96.0
Total current assets	3,524.0	1,991.0
Non-current Assets
Property, plant and equipment	1,165.0	728.0
Goodwill	6,348.0	1,711.0	1,692.0
Intangible assets	1,775.0	258.0
Non-current deferred income taxes	163.0	87.0
Other non-current assets	154.0	144.0
Total non-current assets	9,605.0	2,928.0
Total assets	13,129.0	4,919.0	4,845.0
Current Liabilities
Short-term debt	33.0	58.0
Accounts payable	581.0	324.0
Compensation and benefits	255.0	209.0
Other accrued items	518.0	250.0
Advance payments and unearned income	433.0	266.0
Income taxes payable	57.0	0.0
Current deferred income taxes	7.0	2.0
Deferred compensation plan liabilities	267.0	4.0
Current portion of long-term debt	130.0	2.0
Total current liabilities	2,281.0	1,115.0
Non-current Liabilities
Defined benefit plans	1,943.0	20.0
Long-term debt	5,053.0	1,564.0
Long-term contract liability	71.0	84.0
Non-current deferred income taxes	7.0	0.0
Other long-term liabilities	372.0	311.0
Total non-current liabilities	7,446.0	1,979.0
Shareholders' Equity:
Preferred stock, without par value; 1,000,000 shares authorized; none issued	0.0	0.0
Common stock, $1.00 par value; 500,000,000 shares authorized; issued and outstanding 123,675,756 shares at July 3, 2015 and 105,509,073 shares at June 27, 2014	124.0	106.0
Other capital	2,031.0	509.0
Retained earnings	1,258.0	1,226.0
Accumulated other comprehensive loss	(16.0)	(15.0)
Total shareholders' equity	3,397.0	1,826.0
Noncontrolling interests	5.0	(1.0)
Total equity	3,402.0	1,825.0	$ 1,561.0	$ 1,946.0
Liabilities and Shareholders' Equity	13,129.0	4,919.0
Consolidation, Eliminations [Member]
Current Assets
Cash and cash equivalents	0.0
Receivables	(2,218.0)	(2,152.0)
Total current assets	(2,218.0)	(2,152.0)
Non-current Assets
Non-current deferred income taxes	(111.0)	(17.0)
Investment in Subsidiaries	(8,032.0)	(3,474.0)
Total non-current assets	(8,143.0)	(3,491.0)
Total assets	(10,361.0)	(5,643.0)
Current Liabilities
Accounts payable	(2,218.0)	(2,152.0)
Total current liabilities	(2,218.0)	(2,152.0)
Non-current Liabilities
Non-current deferred income taxes	(111.0)	(17.0)
Total non-current liabilities	(111.0)	(17.0)
Shareholders' Equity:
Other capital	(7,846.0)	(3,276.0)
Retained earnings	(418.0)	(398.0)
Accumulated other comprehensive loss	232.0	200.0
Total shareholders' equity	(8,032.0)	(3,474.0)
Total equity	(8,032.0)	(3,474.0)
Liabilities and Shareholders' Equity	(10,361.0)	(5,643.0)
Harris Parent Company [Member] | Financial Guarantee [Member]
Current Assets
Cash and cash equivalents	151.0	251.0
Receivables	623.0	599.0
Inventories	478.0	482.0
Income taxes receivable	17.0	22.0
Current deferred income taxes	108.0	94.0
Deferred compensation plan investments	12.0	9.0
Other current assets	39.0	30.0
Total current assets	1,428.0	1,487.0
Non-current Assets
Property, plant and equipment	549.0	545.0
Goodwill	656.0	676.0
Intangible assets	31.0	40.0
Non-current deferred income taxes	95.0	104.0
Investment in Subsidiaries	8,030.0	3,474.0
Other non-current assets	110.0	125.0
Total non-current assets	9,471.0	4,964.0
Total assets	10,899.0	6,451.0
Current Liabilities
Short-term debt	0.0	30.0
Accounts payable	2,201.0	2,143.0
Compensation and benefits	128.0	151.0
Other accrued items	246.0	201.0
Advance payments and unearned income	149.0	188.0
Income taxes payable	2.0	1.0
Current deferred income taxes	0.0
Deferred compensation plan liabilities	12.0	4.0
Current portion of long-term debt	130.0	2.0
Total current liabilities	2,868.0	2,720.0
Non-current Liabilities
Defined benefit plans	0.0	16.0
Long-term debt	4,328.0	1,564.0
Long-term contract liability	71.0	84.0
Non-current deferred income taxes	0.0
Other long-term liabilities	235.0	240.0
Total non-current liabilities	4,634.0	1,904.0
Shareholders' Equity:
Common stock, $1.00 par value; 500,000,000 shares authorized; issued and outstanding 123,675,756 shares at July 3, 2015 and 105,509,073 shares at June 27, 2014	124.0	106.0
Other capital	3,731.0	2,254.0
Retained earnings	(202.0)	(338.0)
Accumulated other comprehensive loss	(256.0)	(196.0)
Total shareholders' equity	3,397.0	1,826.0
Noncontrolling interests	0.0	1.0
Total equity	3,397.0	1,827.0
Liabilities and Shareholders' Equity	10,899.0	6,451.0
Exelis Parent Company [Member] | Financial Guarantee [Member]
Current Assets
Cash and cash equivalents	54.0
Receivables	333.0
Inventories	272.0
Income taxes receivable	65.0
Current deferred income taxes	202.0
Deferred compensation plan investments	255.0
Other current assets	68.0
Total current assets	1,249.0
Non-current Assets
Property, plant and equipment	375.0
Goodwill	4,693.0
Intangible assets	1,282.0
Non-current deferred income taxes	179.0
Investment in Subsidiaries	2.0
Other non-current assets	10.0
Total non-current assets	6,541.0
Total assets	7,790.0
Current Liabilities
Accounts payable	164.0
Compensation and benefits	70.0
Other accrued items	226.0
Advance payments and unearned income	187.0
Income taxes payable	44.0
Current deferred income taxes	0.0
Deferred compensation plan liabilities	255.0
Current portion of long-term debt	0.0
Total current liabilities	946.0
Non-current Liabilities
Defined benefit plans	1,923.0
Long-term debt	701.0
Long-term contract liability	0.0
Non-current deferred income taxes	0.0
Other long-term liabilities	38.0
Total non-current liabilities	2,662.0
Shareholders' Equity:
Common stock, $1.00 par value; 500,000,000 shares authorized; issued and outstanding 123,675,756 shares at July 3, 2015 and 105,509,073 shares at June 27, 2014	0.0
Other capital	4,124.0
Retained earnings	(20.0)
Accumulated other comprehensive loss	78.0
Total shareholders' equity	4,182.0
Noncontrolling interests	0.0
Total equity	4,182.0
Liabilities and Shareholders' Equity	7,790.0
Non-Guarantor Subsidiaries [Member]
Current Assets
Cash and cash equivalents	276.0	310.0
Receivables	2,430.0	2,119.0
Inventories	265.0	137.0
Income taxes receivable	5.0	6.0
Current deferred income taxes	31.0	18.0
Deferred compensation plan investments	0.0
Other current assets	58.0	66.0
Total current assets	3,065.0	2,656.0
Non-current Assets
Property, plant and equipment	241.0	183.0
Goodwill	999.0	1,035.0
Intangible assets	462.0	218.0
Non-current deferred income taxes	0.0
Investment in Subsidiaries	0.0
Other non-current assets	34.0	19.0
Total non-current assets	1,736.0	1,455.0
Total assets	4,801.0	4,111.0
Current Liabilities
Short-term debt	33.0	28.0
Accounts payable	434.0	333.0
Compensation and benefits	57.0	58.0
Other accrued items	46.0	49.0
Advance payments and unearned income	97.0	78.0
Income taxes payable	11.0	(1.0)
Current deferred income taxes	7.0	2.0
Deferred compensation plan liabilities	0.0
Current portion of long-term debt	0.0
Total current liabilities	685.0	547.0
Non-current Liabilities
Defined benefit plans	20.0	4.0
Long-term debt	24.0
Long-term contract liability	0.0
Non-current deferred income taxes	118.0	17.0
Other long-term liabilities	99.0	71.0
Total non-current liabilities	261.0	92.0
Shareholders' Equity:
Common stock, $1.00 par value; 500,000,000 shares authorized; issued and outstanding 123,675,756 shares at July 3, 2015 and 105,509,073 shares at June 27, 2014	0.0
Other capital	2,022.0	1,531.0
Retained earnings	1,898.0	1,962.0
Accumulated other comprehensive loss	(70.0)	(19.0)
Total shareholders' equity	3,850.0	3,474.0
Noncontrolling interests	5.0	(2.0)
Total equity	3,855.0	3,472.0
Liabilities and Shareholders' Equity	$ 4,801.0	$ 4,111.0