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DEBT - Schedule of Debt Exchanged (Details) - USD ($) $ in Millions | Jul. 02, 2019 | Jul. 01, 2019 | Jan. 03, 2020 | Jun. 29, 2019 | Jun. 28, 2019 | Jun. 29, 2018
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  | $ 6,951 |  | $ 3,419 | $ 3,712
Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  |  | $ 3,520 |  |
L3 | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate Principal Amount of L3 Notes (prior to debt exchange) |  | $ 3,350 |  |  |  |
Long-term debt | $ 329 |  |  |  |  |
L3 | Senior Unsecured Debt | 4.95% notes due February 15, 2021 (“4.95% 2021 Notes”) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate Principal Amount of L3 Notes (prior to debt exchange) |  | 650 |  |  |  |
Long-term debt | 149 |  |  |  |  |
L3 | Senior Unsecured Debt | 3.85% notes due June 15, 2023 (“3.85% 2023 Notes”) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate Principal Amount of L3 Notes (prior to debt exchange) |  | 800 |  |  |  |
Long-term debt | 59 |  |  |  |  |
L3 | Senior Unsecured Debt | 3.95% notes due May 28, 2024 (“3.95% 2024 Notes”) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate Principal Amount of L3 Notes (prior to debt exchange) |  | 350 |  |  |  |
Long-term debt | 24 |  |  |  |  |
L3 | Senior Unsecured Debt | 3.85% notes due December 15, 2026 (“3.85% 2026 Notes”) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate Principal Amount of L3 Notes (prior to debt exchange) |  | 550 |  |  |  |
Long-term debt | 15 |  |  |  |  |
L3 | Senior Unsecured Debt | 4.40% notes due June 15, 2028 (“4.40% 2028 Notes”) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate Principal Amount of L3 Notes (prior to debt exchange) |  | $ 1,000 |  |  |  |
Long-term debt | 82 |  |  |  |  |
L3Harris | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate Principal Amount of L3 Notes (prior to debt exchange) | 3,350 |  |  |  |  |
Aggregate Principal Amount of New L3Harris Notes Issued | $ 3,021 |  |  |  |  |
L3Harris | Senior Unsecured Debt | 4.95% notes due February 15, 2021 (“4.95% 2021 Notes”) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt exchange, converted interest rate | 4.95% | 4.95% |  |  |  |
Aggregate Principal Amount of New L3Harris Notes Issued | $ 501 |  |  |  |  |
L3Harris | Senior Unsecured Debt | 3.85% notes due June 15, 2023 (“3.85% 2023 Notes”) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt exchange, converted interest rate | 3.85% | 3.85% |  |  |  |
Aggregate Principal Amount of New L3Harris Notes Issued | $ 741 |  |  |  |  |
L3Harris | Senior Unsecured Debt | 3.95% notes due May 28, 2024 (“3.95% 2024 Notes”) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt exchange, converted interest rate | 3.95% | 3.95% |  |  |  |
Aggregate Principal Amount of New L3Harris Notes Issued | $ 326 |  |  |  |  |
L3Harris | Senior Unsecured Debt | 3.85% notes due December 15, 2026 (“3.85% 2026 Notes”) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt exchange, converted interest rate | 3.85% | 3.85% |  |  |  |
Aggregate Principal Amount of New L3Harris Notes Issued | $ 535 |  |  |  |  |
L3Harris | Senior Unsecured Debt | 4.40% notes due June 15, 2028 (“4.40% 2028 Notes”) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt exchange, converted interest rate | 4.40% | 4.40% |  |  |  |
Aggregate Principal Amount of New L3Harris Notes Issued | $ 918 |  |  |  |  |
L3Harris | L3 | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 329 |  |  |  |  |

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