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Business Divestitures - Narrative (Details) $ in Millions |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 02, 2021 USD ($) business | Jul. 31, 2020 USD ($) | May 15, 2020 USD ($) | May 04, 2020 USD ($) | Jul. 02, 2021 USD ($) business | Apr. 02, 2021 USD ($) | Jul. 03, 2020 USD ($) | Apr. 03, 2020 USD ($) | Jul. 02, 2021 USD ($) business | Jul. 03, 2020 USD ($) | Jan. 01, 2021 USD ($) | Feb. 23, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net cash proceeds from sale of business, after selling costs and estimated price adjustments |  |  |  |  |  |  |  |  | $ 4 | $ 0 |  |
Pre-tax loss recognized to reduce fair value of assets of disposal group |  |  |  |  | $ 63 |  | $ 14 |  | 125 | 19 |  |
Non-cash goodwill impairment charge |  |  |  |  |  |  |  |  | 62 | 369 |  |
Business divestiture-related gains (losses) |  |  |  |  | 180 |  | (49) |  | 165 | (52) |  |
Aviation Systems |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash goodwill impairment charge |  |  |  |  |  |  |  |  | 62 | 364 |  |
Communication Systems |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash goodwill impairment charge |  |  |  |  |  |  |  |  | 0 | 0 |  |
Space and Airborne Systems |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash goodwill impairment charge |  |  |  |  |  |  |  |  | 0 | 5 |  |
Held-for-sale |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill assigned to disposal group | $ 26 |  |  |  | 26 |  |  |  | 26 |  |  |
Assets of disposal group held for sale | 479 |  |  |  | 479 |  |  |  | 479 |  |  |
Liabilities of disposal group held for sale | 243 |  |  |  | 243 |  |  |  | 243 |  |  |
Held-for-sale | Electron Devices business |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill assigned to disposal group | 15 |  |  |  | 15 |  |  |  | 15 |  |  |
Assets of disposal group held for sale | 309 |  |  |  | 309 |  |  |  | 309 |  |  |
Liabilities of disposal group held for sale | 180 |  |  |  | 180 |  |  |  | 180 |  |  |
Held-for-sale | Electron Devices business | Aviation Systems |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale price of business | 185 |  |  |  | 185 |  |  |  | 185 |  |  |
Held-for-sale | Aerospace disposal group |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill assigned to disposal group | 11 |  |  |  | 11 |  |  |  | 11 |  |  |
Assets of disposal group held for sale | 155 |  |  |  | 155 |  |  |  | 155 |  |  |
Liabilities of disposal group held for sale | $ 61 |  |  |  | $ 61 |  |  |  | $ 61 |  |  |
Held-for-sale | Aerospace disposal group | Aviation Systems |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of businesses classified as held-for-sale | business | 2 |  |  |  | 2 |  |  |  | 2 |  |  |
Held-for-sale | VSE disposal group |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill assigned to disposal group | $ 0 |  |  |  | $ 0 |  | 14 |  | $ 0 | 14 |  |
Business divestiture-related gains (losses) |  |  |  |  |  |  | 18 |  |  |  |  |
Assets of disposal group held for sale | 15 |  |  |  | 15 |  |  |  | 15 |  |  |
Liabilities of disposal group held for sale | 2 |  |  |  | 2 |  |  |  | 2 |  |  |
Held-for-sale | VSE disposal group | Aviation Systems |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill assigned to disposal group |  |  |  |  |  |  | 14 |  |  | 14 |  |
Non-cash goodwill impairment charge |  |  |  |  |  |  | 14 |  |  |  | $ 14 |
Held-for-sale | VSE disposal group | Aviation Systems |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax loss recognized to reduce fair value of assets of disposal group |  |  |  |  |  |  |  |  |  |  | 32 |
Non-cash remeasurement loss recognized on remaining assets of disposal group |  |  |  |  |  |  |  |  |  |  | 18 |
Assets of disposal group held for sale |  |  |  |  |  |  |  |  |  |  | 35 |
Liabilities of disposal group held for sale |  |  |  |  |  |  |  |  |  |  | $ 13 |
Held-for-sale | CPS business | Aviation Systems |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash goodwill impairment charge |  |  |  |  |  | $ 62 |  |  |  |  |  |
Held-for-sale or Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business divestiture-related gains (losses) |  |  |  |  | 180 |  | (49) |  | 165 | (52) |  |
Held-for-sale or Disposed of by Sale | VSE disposal group |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business divestiture-related gains (losses) |  |  |  |  | (18) |  | (14) |  | (26) | (14) |  |
Held-for-sale or Disposed of by Sale | VSE disposal group | Aviation Systems |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale price of business |  |  |  |  |  |  |  |  |  |  |  | $ 20
Held-for-sale or Disposed of by Sale | CPS business |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business divestiture-related gains (losses) |  |  |  |  | (12) |  | 0 |  | (19) | 0 |  |
Held-for-sale or Disposed of by Sale | Military training business |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business divestiture-related gains (losses) |  |  |  |  | 212 |  | 0 |  | 212 | 0 |  |
Held-for-sale or Disposed of by Sale | Airport security and automation business |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business divestiture-related gains (losses) |  |  |  |  | 0 |  | $ (23) |  | 0 | $ (26) |  |
Disposed of by Sale | VSE disposal group | Aviation Systems |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net cash proceeds from sale of business, after selling costs and estimated price adjustments | 2 |  |  |  |  |  |  |  |  |  |  |
Disposed of by Sale | CPS business | Aviation Systems |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill assigned to disposal group |  |  |  |  |  | $ 174 |  |  |  |  |  |
Disposed of by Sale | CPS business | Aviation Systems |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale price of business | 398 |  |  |  | 398 |  |  |  | 398 |  |  |
Net cash proceeds from sale of business, after selling costs and estimated price adjustments | 347 |  |  |  |  |  |  |  |  |  |  |
Accrued selling costs | 6 |  |  |  | 6 |  |  |  | 6 |  |  |
Disposed of by Sale | Military training business | Aviation Systems |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale price of business | 1,050 |  |  |  | 1,050 |  |  |  | 1,050 |  |  |
Net cash proceeds from sale of business, after selling costs and estimated price adjustments | 1,057 |  |  |  |  |  |  |  |  |  |  |
Accrued selling costs | $ 17 |  |  |  | $ 17 |  |  |  | $ 17 |  |  |
Disposed of by Sale | EOTech Business | Communication Systems |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale price of business |  | $ 42 |  |  |  |  |  |  |  |  |  |
Net cash proceeds from sale of business, after selling costs and estimated price adjustments |  | $ 40 |  |  |  |  |  |  |  |  |  |
Disposed of by Sale | Applied Kilovolts and Analytical Instrumentation business | Space and Airborne Systems |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash goodwill impairment charge |  |  |  |  |  |  |  | $ 5 |  |  |  |
Disposed of by Sale | Applied Kilovolts and Analytical Instrumentation business | Space and Airborne Systems |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net cash proceeds from sale of business, after selling costs and estimated price adjustments |  |  | $ 12 |  |  |  |  |  |  |  |  |
Disposed of by Sale | Airport security and automation business | Aviation Systems |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale price of business |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
Net cash proceeds from sale of business, after selling costs and estimated price adjustments |  |  |  | $ 987 |  |  |  |  |  |  |  |

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