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BUSINESS SEGMENTS - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 03, 2020 | Dec. 28, 2018 | Jun. 28, 2019 | Jun. 29, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | $ 9,263 | $ 3,208 | $ 6,801 | $ 6,168 | $ 5,897
United States |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 8,485 |  | 6,530 | 5,854 | 5,637
International |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 778 |  | 271 | 314 | 260
Integrated Mission Systems |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 2,774 |  | 48 | 45 | 38
Integrated Mission Systems | United States |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 2,300 |  | 30 | 39 | 27
Integrated Mission Systems | International |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 474 |  | 18 | 6 | 11
Integrated Mission Systems | Fixed-price |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 2,138 |  | 48 | 45 | 37
Integrated Mission Systems | Cost-reimbursable |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 636 |  | 0 | 0 | 1
Integrated Mission Systems | Prime contractor |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 1,904 |  | 25 | 20 | 24
Integrated Mission Systems | Subcontractor |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 870 |  | 23 | 25 | 14
Communication Systems |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 2,151 |  | 2,208 | 2,015 | 1,891
Communication Systems | United States |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 1,518 |  | 1,281 | 1,031 | 880
Communication Systems | International |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 633 |  | 927 | 984 | 1,011
Communication Systems | Fixed-price |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 1,849 |  |  |  |
Communication Systems | Cost-reimbursable |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 302 |  |  |  |
Communication Systems | Prime contractor |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 1,406 |  |  |  |
Communication Systems | Subcontractor |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 745 |  |  |  |
Aviation Systems |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 2,038 |  | 672 | 668 | 697
Aviation Systems | United States |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 1,514 |  | 644 | 627 | 647
Aviation Systems | International |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 524 |  | 28 | 41 | 50
Aviation Systems | Fixed-price |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 1,688 |  | 587 | 582 | 636
Aviation Systems | Cost-reimbursable |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 350 |  | 85 | 86 | 61
Aviation Systems | Prime contractor |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 1,246 |  | 654 | 656 | 697
Aviation Systems | Subcontractor |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 792 |  | 18 | 12 | 0
Transferred over Time | Space and Airborne Systems |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 2,360 |  | 3,715 | 3,304 | 3,156
Transferred over Time | Space and Airborne Systems | United States |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 2,037 |  | 3,255 | 2,937 | 2,782
Transferred over Time | Space and Airborne Systems | International |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 323 |  | 460 | 367 | 374
Transferred over Time | Space and Airborne Systems | Fixed-price |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 1,367 |  | 2,097 | 1,634 | 1,390
Transferred over Time | Space and Airborne Systems | Cost-reimbursable |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 993 |  | 1,618 | 1,670 | 1,766
Transferred over Time | Space and Airborne Systems | Prime contractor |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | 1,337 |  | 2,246 | 2,159 | 2,067
Transferred over Time | Space and Airborne Systems | Subcontractor |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | $ 1,023 |  | $ 1,469 | $ 1,145 | $ 1,089

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