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Goodwill and Other Intangible Assets - Goodwill by Business Segment (Details) | 3 Months Ended | 9 Months Ended
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Sep. 27, 2019 USD ($) | Oct. 02, 2020 USD ($) divestiture
Changes in the carrying amount of goodwill |  |
Balance at January 3, 2020 |  | $ 20,001,000,000
Goodwill decrease from divestitures |  | (541,000,000)
Impairment of goodwill | $ 0 | (369,000,000)
Currency translation adjustments |  | (8,000,000)
Other (including adjustments to previously estimated fair value of assets acquired and liabilities assumed) |  | (91,000,000)
Balance at October 2, 2020 |  | $ 18,992,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |
Changes in the carrying amount of goodwill |  |
Number of businesses divestitures | divestiture |  | 3
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Applied Kilovolts and Analytical Instrumentation, Airport Security and Automation and EOTech Businesses |  |
Changes in the carrying amount of goodwill |  |
Goodwill decrease from divestitures |  | $ (541,000,000)
Number of businesses divestitures | divestiture |  | 3
Integrated Mission Systems |  |
Changes in the carrying amount of goodwill |  |
Balance at January 3, 2020 |  | $ 5,768,000,000
Goodwill decrease from divestitures |  | 0
Impairment of goodwill |  | 0
Currency translation adjustments |  | (3,000,000)
Other (including adjustments to previously estimated fair value of assets acquired and liabilities assumed) |  | 740,000,000
Balance at October 2, 2020 |  | 6,505,000,000
Space and Airborne Systems |  |
Changes in the carrying amount of goodwill |  |
Balance at January 3, 2020 |  | 5,131,000,000
Goodwill decrease from divestitures |  | (2,000,000)
Impairment of goodwill |  | (5,000,000)
Currency translation adjustments |  | (4,000,000)
Other (including adjustments to previously estimated fair value of assets acquired and liabilities assumed) |  | 112,000,000
Balance at October 2, 2020 |  | 5,232,000,000
Communication Systems |  |
Changes in the carrying amount of goodwill |  |
Balance at January 3, 2020 |  | 4,243,000,000
Goodwill decrease from divestitures |  | (9,000,000)
Impairment of goodwill |  | 0
Currency translation adjustments |  | (2,000,000)
Other (including adjustments to previously estimated fair value of assets acquired and liabilities assumed) |  | (82,000,000)
Balance at October 2, 2020 |  | 4,150,000,000
Aviation Systems |  |
Changes in the carrying amount of goodwill |  |
Balance at January 3, 2020 |  | 4,859,000,000
Goodwill decrease from divestitures |  | (530,000,000)
Impairment of goodwill |  | (364,000,000)
Currency translation adjustments |  | 1,000,000
Other (including adjustments to previously estimated fair value of assets acquired and liabilities assumed) |  | (861,000,000)
Balance at October 2, 2020 |  | $ 3,105,000,000

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