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DEBT - Debt Exchanged Narrative (Details) - Senior Unsecured Debt $ in Millions | May 05, 2020 | Jul. 02, 2019 USD ($) | Jul. 01, 2019 USD ($) | Dec. 14, 2020
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L3Harris |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount of L3 Notes (prior to debt exchange) |  | $ 3,350 |  |
Debt exchange to cash conversion ratio |  | 0.001 |  |
4.95% notes due February 15, 2021 (“4.95% 2021 Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of debt exchanged | 9990.00% |  |  |
Debt exchange, converted interest rate | 4.95% |  |  |
4.95% notes due February 15, 2021 (“4.95% 2021 Notes”) | L3Harris |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate margin |  | 0.25% |  |
Debt exchange, converted interest rate |  | 4.95% | 4.95% |
3.85% notes, due June 15, 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of debt exchanged | 9990.00% |  |  |
Debt exchange, converted interest rate | 3.85% |  |  |
3.85% notes, due June 15, 2023 | L3Harris |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt interest rate |  | 3.85% |  |
Debt instrument redemption price percentage |  | 100.00% |  |
Interest rate margin |  | 0.20% |  |
Debt exchange, converted interest rate |  | 3.85% | 3.85% |
3.95% notes due May 28, 2024 (“3.95% 2024 Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of debt exchanged | 9990.00% |  |  |
Debt exchange, converted interest rate | 3.95% |  |  |
3.95% notes due May 28, 2024 (“3.95% 2024 Notes”) | L3Harris |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt interest rate |  | 3.95% |  |
Interest rate margin |  | 0.20% |  |
Debt exchange, converted interest rate |  | 3.95% | 3.95% |
3.85% notes due December 15, 2026 (“3.85% 2026 Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of debt exchanged | 9990.00% |  |  |
Debt exchange, converted interest rate | 3.85% |  |  |
3.85% notes due December 15, 2026 (“3.85% 2026 Notes”) | L3Harris |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt interest rate |  | 3.85% |  |
Interest rate margin |  | 0.25% |  |
Debt exchange, converted interest rate |  | 3.85% | 3.85% |
4.40% notes due June 15, 2028 (“4.40% 2028 Notes”) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of debt exchanged | 9890.00% |  |  |
Debt exchange, converted interest rate | 4.40% |  |  |
4.40% notes due June 15, 2028 (“4.40% 2028 Notes”) | L3Harris |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt interest rate |  | 4.40% |  |
Interest rate margin |  | 0.25% |  |
Debt exchange, converted interest rate |  | 4.40% | 4.40% |
L3 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount of L3 Notes (prior to debt exchange) |  |  | $ 3,350 |
Long-term debt |  | $ 329 |  |
L3 | L3Harris |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | 329 |  |
L3 | 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 |  |
Debt interest rate |  |  |  | 4.95%
L3 | 3.85% notes, due June 15, 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount of L3 Notes (prior to debt exchange) |  |  | 800 |
Long-term debt |  | 59 |  |
L3 | 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 | 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 | 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 |  |

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- Definition Dividend or interest rate associated with the financial instrument issued in exchange for the original debt being converted in a noncash or part noncash transaction. Noncash are transactions that affect recognized assets or liabilities but that do not result in cash receipts or cash payments. Part noncash refers to that portion of the transaction not resulting in cash receipts or cash payments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586 + Details
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