Condensed Consolidating Financial Statements (Details 3) - USD ($) $ in Millions	12 Months Ended
	Jul. 03, 2015	Jun. 27, 2014	Jun. 28, 2013	Jun. 29, 2012
Guarantor Obligations [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ 854.0	$ 849.0	$ 833.0
Investing Activities
Net cash paid for acquired businesses	3,186.0	0.0	0.0
Cash paid for cost-method investment	0.0	0.0	(1.0)
Additions of property, plant and equipment	148.0	209.0	165.0
Additions of capitalized software	0.0	0.0	(13.0)
Proceeds from sale of property, plant and equipment	0.0	8.0	0.0
Proceeds from sale of business	43.0	0.0	0.0
Proceeds from sale of discontinued operations	7.0	42.0	147.0
Proceeds from sale of securities available-for-sale	0.0	0.0	12.0
Net Cash Provided by (Used in) Investing Activities	(3,284.0)	(162.0)	(20.0)
Financing Activities
Proceeds from borrowings, net of issuance costs	3,683.0	34.0	18.0
Repayment of borrowings	954.0	134.0	364.0
Payment of contingent consideration	0.0	0.0	(12.0)
Proceeds from exercises of employee stock options	47.0	141.0	98.0
Repurchases of common stock	166.0	309.0	415.0
Cash dividends	198.0	180.0	165.0
Other financing activities	(39.0)
Net cash provided by (used in) financing activities	2,373.0	(448.0)	(840.0)
Effect of exchange rate changes on cash and cash equivalents	(23.0)	1.0	(8.0)
Net increase (decrease) in cash and cash equivalents	(80.0)	240.0	(35.0)
Cash and cash equivalents, beginning of year	561.0	321.0	356.0
Cash and cash equivalents, end of year	481.0	561.0	321.0	$ 356.0
Consolidation, Eliminations [Member]
Financing Activities
Cash and cash equivalents, end of year	0.0
Consolidation, Eliminations [Member] | Statement of Cash Flows [Member]
Guarantor Obligations [Line Items]
Net Cash Provided by (Used in) Operating Activities	7.0	(10.0)		24.0
Investing Activities
Intercompany loans (investing activities)	164.0	77.0		284.0
Net cash paid for acquired businesses	(130.0)
Net Cash Provided by (Used in) Investing Activities	294.0			284.0
Financing Activities
Intercompany loans (financing activities)	(286.0)	(77.0)		(284.0)
Cash dividends	(115.0)	(10.0)		24.0
Net cash provided by (used in) financing activities	(171.0)			(308.0)
Effect of exchange rate changes on cash and cash equivalents		(67.0)
Net increase (decrease) in cash and cash equivalents	130.0
Cash and cash equivalents, beginning of year	(130.0)
Cash and cash equivalents, end of year		(130.0)
Harris Parent Company [Member] | Financial Guarantee [Member]
Financing Activities
Cash and cash equivalents, beginning of year	251.0
Cash and cash equivalents, end of year	151.0	251.0
Harris Parent Company [Member] | Financial Guarantee [Member] | Statement of Cash Flows [Member]
Guarantor Obligations [Line Items]
Net Cash Provided by (Used in) Operating Activities	906.0	635.0	474.0
Investing Activities
Intercompany loans (investing activities)	(63.0)	35.0	25.0
Net cash paid for acquired businesses	3,316.0	3.0
Cash paid for cost-method investment			(1.0)
Additions of property, plant and equipment	103.0	150.0	91.0
Additions of capitalized software			(13.0)
Proceeds from sale of property, plant and equipment		8.0
Proceeds from sale of business	3.0
Proceeds from sale of discontinued operations	7.0	42.0	64.0
Proceeds from sale of securities available-for-sale			12.0
Net Cash Provided by (Used in) Investing Activities	(3,472.0)	(68.0)	(4.0)
Financing Activities
Intercompany loans (financing activities)	101.0	112.0	309.0
Proceeds from borrowings, net of issuance costs	3,651.0		3.0
Repayment of borrowings	927.0	110.0	356.0
Payment of contingent consideration			(12.0)
Proceeds from exercises of employee stock options	47.0	141.0	98.0
Repurchases of common stock	166.0	309.0	415.0
Cash dividends	198.0	180.0	165.0
Other financing activities	(39.0)
Net cash provided by (used in) financing activities	2,469.0	(346.0)	(538.0)
Net increase (decrease) in cash and cash equivalents	(97.0)	221.0	(68.0)
Cash and cash equivalents, beginning of year	252.0	31.0	99.0
Cash and cash equivalents, end of year	155.0	252.0	31.0	99.0
Exelis Parent Company [Member] | Financial Guarantee [Member]
Financing Activities
Cash and cash equivalents, end of year	54.0
Exelis Parent Company [Member] | Financial Guarantee [Member] | Statement of Cash Flows [Member]
Guarantor Obligations [Line Items]
Net Cash Provided by (Used in) Operating Activities	(84.0)
Investing Activities
Additions of property, plant and equipment	2.0
Net Cash Provided by (Used in) Investing Activities	(2.0)
Financing Activities
Intercompany loans (financing activities)	122.0
Net cash provided by (used in) financing activities	122.0
Net increase (decrease) in cash and cash equivalents	36.0
Cash and cash equivalents, beginning of year	15.0
Cash and cash equivalents, end of year	51.0	15.0
Non-Guarantor Subsidiaries [Member]
Financing Activities
Cash and cash equivalents, beginning of year	310.0
Cash and cash equivalents, end of year	276.0	310.0
Non-Guarantor Subsidiaries [Member] | Statement of Cash Flows [Member]
Guarantor Obligations [Line Items]
Net Cash Provided by (Used in) Operating Activities	25.0	224.0	335.0
Investing Activities
Intercompany loans (investing activities)	(101.0)	(112.0)	(309.0)
Additions of property, plant and equipment	43.0	59.0	74.0
Proceeds from sale of business	40.0
Proceeds from sale of discontinued operations			83.0
Net Cash Provided by (Used in) Investing Activities	(104.0)	(171.0)	(300.0)
Financing Activities
Intercompany loans (financing activities)	63.0	(35.0)	(25.0)
Proceeds from borrowings, net of issuance costs	32.0	34.0	15.0
Repayment of borrowings	27.0	24.0	8.0
Cash dividends	115.0	10.0	(24.0)
Net cash provided by (used in) financing activities	(47.0)	(35.0)	6.0
Effect of exchange rate changes on cash and cash equivalents	(23.0)	1.0	(8.0)
Net increase (decrease) in cash and cash equivalents	(149.0)	19.0	33.0
Cash and cash equivalents, beginning of year	424.0	290.0	257.0
Cash and cash equivalents, end of year	$ 275.0	424.0	$ 290.0	$ 257.0
Non-Guarantor Subsidiaries [Member] | Consolidation, Eliminations [Member] | Statement of Cash Flows [Member]
Investing Activities
Net Cash Provided by (Used in) Investing Activities		$ 77.0