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Acquisitions and Divestitures, Goodwill, and Intangible Assets Changes In Amount Of Goodwill (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Apr. 02, 2017 | Dec. 31, 2015
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period | [1] | $ 11,445 |
Acquisitions | [2] | 33 |
Other | [3] | 54 |
Goodwill, end of period |  | 11,532 |
Aerospace |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period | [1] | 2,537 |
Acquisitions | [2] | 33 |
Other | [3] | 35 |
Goodwill, end of period |  | 2,605 |
Combat Systems |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period | [1] | 2,598 |
Acquisitions | [2] | 0 |
Other | [3] | 15 |
Goodwill, end of period |  | 2,613 |
Information Systems and Technology |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period | [1] | 6,013 |
Acquisitions | [2] | 0 |
Other | [3] | 4 |
Goodwill, end of period |  | 6,017 |
Accumulated impairment loss |  |  | $ 2,000
Marine Systems |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period | [1] | 297 |
Acquisitions | [2] | 0 |
Other | [3] | 0 |
Goodwill, end of period |  | $ 297 |
[1] | Goodwill on December 31, 2016, in the Information Systems and Technology reporting unit is net of $2 billion of accumulated impairment losses.
[2] | Includes adjustments during the purchase price allocation period.
[3] | Consists primarily of adjustments for foreign currency translation.

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