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BUSINESS SEGMENTS - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 03, 2020 business | Jan. 03, 2020 USD ($) | Dec. 28, 2018 USD ($) | Jan. 01, 2021 USD ($) segment | Jan. 03, 2020 USD ($) | Jun. 28, 2019 USD ($) | Jun. 29, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  | 4 |  |  |
Number of operating segments | segment |  |  |  | 4 |  |  |
Number of businesses transferred | business | 2 |  |  |  |  |  |
Amortization of intangible assets, debt premium, debt discount and debt issuance costs |  | $ 285 |  | $ 714 |  | $ 120 | $ 116
Revenue |  | 9,263 | $ 3,208 | 18,194 | $ 12,856 | 6,801 | 6,168
International |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | $ 778 |  | $ 1,196 |  | $ 271 | $ 314
Revenue from Contract with Customer Benchmark | Government Contracts Concentration Risk |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  | 73.00% |  | 78.00% |  | 77.00% | 75.00%
Revenue, Segment Benchmark | Product Concentration Risk | Integrated Mission Systems |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 34.00% |  |  |
Revenue, Segment Benchmark | Product Concentration Risk | Space and Airborne Systems |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 16.00% |  |  |
Revenue, Segment Benchmark | Product Concentration Risk | Communication Systems |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 15.00% |  |  |
Revenue, Segment Benchmark | Product Concentration Risk | Aviation Systems |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 38.00% |  |  |
Revenue, Product and Service Benchmark | Geographic Concentration Risk | International |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  | 21.00% |  | 20.00% |  | 22.00% | 23.00%
Revenue |  | $ 2,000 |  | $ 3,700 |  | $ 1,500 | $ 1,400

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