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Goodwill and Other Intangible Assets - Goodwill by Business Segment (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 27, 2019 | Jul. 03, 2020
Changes in the carrying amount of goodwill |  |
Balance at January 3, 2020 |  | $ 20,001,000,000
Goodwill decrease from divestitures |  | (533,000,000)
Decrease from reclassification to assets of disposal group held for sale |  | (9,000,000)
Impairment of goodwill | $ 0 | (369,000,000)
Currency translation adjustments |  | (11,000,000)
Other (including adjustments to previously estimated fair value of assets acquired and liabilities assumed) |  | (64,000,000)
Balance at July 3, 2020 |  | 19,015,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Applied Kilovolts and Analytical Instrumentation Business |  |
Changes in the carrying amount of goodwill |  |
Goodwill decrease from divestitures |  | (533,000,000)
Integrated Mission Systems |  |
Changes in the carrying amount of goodwill |  |
Balance at January 3, 2020 |  | 5,768,000,000
Goodwill decrease from divestitures |  | 0
Decrease from reclassification to assets of disposal group held for sale |  | 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 July 3, 2020 |  | 6,511,000,000
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)
Decrease from reclassification to assets of disposal group held for sale |  | 0
Impairment of goodwill |  | (5,000,000)
Currency translation adjustments |  | (7,000,000)
Other (including adjustments to previously estimated fair value of assets acquired and liabilities assumed) |  | 124,000,000
Balance at July 3, 2020 |  | 5,241,000,000
Communication Systems |  |
Changes in the carrying amount of goodwill |  |
Balance at January 3, 2020 |  | 4,243,000,000
Goodwill decrease from divestitures |  | 0
Decrease from reclassification to assets of disposal group held for sale |  | (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) |  | (81,000,000)
Balance at July 3, 2020 |  | 4,151,000,000
Communication Systems | Disposal Group, Held-for-sale, Not Discontinued Operations | EOTech Business |  |
Changes in the carrying amount of goodwill |  |
Decrease from reclassification to assets of disposal group held for sale |  | (9,000,000)
Aviation Systems |  |
Changes in the carrying amount of goodwill |  |
Balance at January 3, 2020 |  | 4,859,000,000
Goodwill decrease from divestitures |  | (531,000,000)
Decrease from reclassification to assets of disposal group held for sale |  | 0
Impairment of goodwill |  | (364,000,000)
Currency translation adjustments |  | (5,000,000)
Other (including adjustments to previously estimated fair value of assets acquired and liabilities assumed) |  | (847,000,000)
Balance at July 3, 2020 |  | $ 3,112,000,000

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