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Basis of Presentation - Additional Information (Detail) - USD ($)
$ in Billions
Nov. 06, 2015
Aug. 24, 2016
Sikorsky Aircraft Corporation    
Basis of Presentation [Line Items]    
Acquisitions of businesses and investments in affiliates $ 9.0  
AWE Management Limited    
Basis of Presentation [Line Items]    
Ownership interest percentage acquired   18.00%
Noncontrolling Interest, Ownership Percentage by Parent   51.00%