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Long-Term Debt - Additional Information (Details) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 27, 2018 | Nov. 06, 2017 | May 29, 2015 | Mar. 30, 2018 | Mar. 30, 2018 | Jun. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross |  |  |  | $ 4,212,000,000 | $ 4,212,000,000 | $ 3,945,000,000
Variable Rate Term Loan Agreement | Exelis |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument term |  |  | 5 years |  |  |
Long-term debt, gross |  |  | $ 1,300,000,000 |  |  |
Non-operating loss on unamortized debt issuance costs associated with extinguished debt |  |  |  | 1,000,000 |  |
Variable-rate debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross |  |  |  | 570,000,000 | 570,000,000 | 305,000,000
Variable-rate debt | Floating rate notes, due February 27, 2019 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt issued | $ 300,000,000 |  |  |  |  |
Debt issuance costs | $ 2,000,000 |  |  |  |  |
Debt repurchase price as percentage of aggregate principal amount | 101.00% |  |  |  |  |
Long-term debt, gross |  |  |  | 300,000,000 | 300,000,000 | 0
Variable-rate debt | Floating rate notes, due February 27, 2019 | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate margin | 0.475% |  |  |  |  |
Variable-rate debt | Floating rate notes, due April 30, 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt issued |  | $ 250,000,000 |  |  |  |
Debt issuance costs |  | $ 2,000,000 |  |  |  |
Debt repurchase price as percentage of aggregate principal amount |  | 101.00% |  |  |  |
Long-term debt, gross |  |  |  | 250,000,000 | $ 250,000,000 | $ 0
Variable-rate debt | Floating rate notes, due April 30, 2020 | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate margin |  | 0.48% |  |  |  |
Variable-rate debt | Term loan, 5-year tranche, due May 29, 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of debt |  | $ 253,000,000 |  |  |  |
Debt instrument term |  |  |  |  | 5 years | 5 years
Long-term debt, gross |  |  |  | $ 0 | $ 0 | $ 269,000,000

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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