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Changes in the Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |  |
Goodwill, beginning balance | $ 10,695 | $ 7,964 | [1]
Purchase accounting adjustments | 78 |  |
Other | (9) | (33) |
Goodwill, ending balance | 10,764 | 10,695 |
Sikorsky Aircraft Corporation |  |  |
Goodwill [Line Items] |  |  |
Acquisitions |  | 2,764 |
Aeronautics |  |  |
Goodwill [Line Items] |  |  |
Goodwill, beginning balance | 171 | 171 | [1]
Goodwill, ending balance | 171 | 171 |
Missiles and Fire Control |  |  |
Goodwill [Line Items] |  |  |
Goodwill, beginning balance | 2,198 | 2,181 | [1]
Other | 62 | 17 |
Goodwill, ending balance | 2,260 | 2,198 |
Rotary and Mission Systems |  |  |
Goodwill [Line Items] |  |  |
Goodwill, beginning balance | 6,738 | 4,022 | [1]
Purchase accounting adjustments | 78 |  |
Other | (68) | (48) |
Goodwill, ending balance | 6,748 | 6,738 |
Rotary and Mission Systems | Sikorsky Aircraft Corporation |  |  |
Goodwill [Line Items] |  |  |
Acquisitions |  | 2,764 |
Space Systems |  |  |
Goodwill [Line Items] |  |  |
Goodwill, beginning balance | 1,588 | 1,590 | [1]
Other | (3) | (2) |
Goodwill, ending balance | $ 1,585 | $ 1,588 |
[1] | Includes reclassifications of goodwill among our business segments as a result of our program realignment, which occurred during the fourth quarter of 2015 (see "Note 1 - Significant Accounting Policies").

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