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BUSINESS SEGMENTS - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 27, 2019 segment | Jan. 03, 2020 USD ($) segment | Jun. 28, 2019 USD ($) | Jun. 29, 2018 USD ($) | Jun. 30, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments | segment |  | 4 |  |  |
Number of operating segments | segment | 4 |  |  |  |
Amortization of intangible assets, debt premium, debt discount and debt issuance costs | $ |  | $ 285 | $ 120 | $ 116 | $ 125
Geographic Concentration Risk | Total Revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Concentration risk percentage |  | 5.00% | 5.00% | 5.00% | 5.00%
Government Contracts Concentration Risk | Total Revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Concentration risk percentage |  | 73.00% | 77.00% | 75.00% | 74.00%
Product Concentration Risk | Total Revenue |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Concentration risk percentage |  | 21.00% | 22.00% | 23.00% | 25.00%
Export revenue | $ |  | $ 2,000 | $ 1,500 | $ 1,400 | $ 1,500
Product Concentration Risk | Sales revenue service | Integrated Mission Systems |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Concentration risk percentage |  | 32.00% |  |  |
Product Concentration Risk | Sales revenue service | Space and Airborne Systems |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Concentration risk percentage |  | 16.00% |  |  |
Product Concentration Risk | Sales revenue service | Communication Systems |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Concentration risk percentage |  | 15.00% |  |  |
Product Concentration Risk | Sales revenue service | Aviation Systems |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Concentration risk percentage |  | 39.00% |  |  |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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