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DEBT - Debt Exchanged Narrative (Details) $ in Millions | Jul. 02, 2019 USD ($) day | Jul. 01, 2019 USD ($) | Jan. 03, 2020 USD ($) | Jun. 29, 2019 USD ($) | Jun. 28, 2019 USD ($) | Jun. 29, 2018 USD ($)
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  | $ 6,951 |  | $ 3,419 | $ 3,712
Unamortized bond premium |  |  | $ 154 |  | $ 0 | $ 0
Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  |  | $ 3,520 |  |
Unamortized bond premium |  |  |  | $ 171 |  |
L3Harris | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate Principal Amount of L3 Notes (prior to debt exchange) | $ 3,350 |  |  |  |  |
Debt exchange to cash conversion ratio | 0.001 |  |  |  |  |
Days in registered exchange offer period | day | 365 |  |  |  |  |
Debt special additional interest rate percentage per year | 0.25% |  |  |  |  |
Days in registered exchange offer period following date of default | day | 90 |  |  |  |  |
4.95% notes due February 15, 2021 (“4.95% 2021 Notes”) | L3Harris | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 4.95% |  |  |  |  |
Interest rate margin | 0.25% |  |  |  |  |
3.85% notes due June 15, 2023 (“3.85% 2023 Notes”) | L3Harris | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 3.85% |  |  |  |  |
Debt instrument redemption price percentage | 100.00% |  |  |  |  |
Interest rate margin | 0.20% |  |  |  |  |
3.85% notes due December 15, 2026 (“3.85% 2026 Notes”) | L3Harris | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 3.85% |  |  |  |  |
Interest rate margin | 0.25% |  |  |  |  |
4.40% notes due June 15, 2028 (“4.40% 2028 Notes”) | L3Harris | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 4.40% |  |  |  |  |
Interest rate margin | 0.25% |  |  |  |  |
3.95% notes due May 28, 2024 (“3.95% 2024 Notes”) | L3Harris | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 3.95% |  |  |  |  |
Interest rate margin | 0.20% |  |  |  |  |
Minimum | L3Harris | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt special additional interest rate percentage per year | 0.25% |  |  |  |  |
Maximum | L3Harris | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt special additional interest rate percentage per year | 0.50% |  |  |  |  |
L3 | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 329 |  |  |  |  |
Aggregate Principal Amount of L3 Notes (prior to debt exchange) |  | $ 3,350 |  |  |  |
L3 | L3Harris | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 329 |  |  |  |  |
L3 | 4.95% notes due February 15, 2021 (“4.95% 2021 Notes”) | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 149 |  |  |  |  |
Aggregate Principal Amount of L3 Notes (prior to debt exchange) |  | 650 |  |  |  |
L3 | 3.85% notes due June 15, 2023 (“3.85% 2023 Notes”) | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 59 |  |  |  |  |
Aggregate Principal Amount of L3 Notes (prior to debt exchange) |  | 800 |  |  |  |
L3 | 3.85% notes due December 15, 2026 (“3.85% 2026 Notes”) | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 15 |  |  |  |  |
Aggregate Principal Amount of L3 Notes (prior to debt exchange) |  | 550 |  |  |  |
L3 | 4.40% notes due June 15, 2028 (“4.40% 2028 Notes”) | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 82 |  |  |  |  |
Aggregate Principal Amount of L3 Notes (prior to debt exchange) |  | 1,000 |  |  |  |
L3 | 3.95% notes due May 28, 2024 (“3.95% 2024 Notes”) | Senior Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 24 |  |  |  |  |
Aggregate Principal Amount of L3 Notes (prior to debt exchange) |  | $ 350 |  |  |  |

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