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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").