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Summary of Quarterly Information (Parenthetical) (Detail) - USD ($)
$ in Millions
 2 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information [Line Items]              
Recognized tax benefit for the impact of the tax credit         $ 71 $ 66 $ 96
Non-cash goodwill impairment charge     $ 119 $ 195   119 [1],[2] $ 195 [2]
Reduction in net earnings due to non-cash goodwill impairment charge     107 $ 176      
Sikorsky Aircraft Corporation              
Quarterly Financial Information [Line Items]              
Net sales $ 400            
Operating profit $ (45)            
Workforce Reductions              
Quarterly Financial Information [Line Items]              
Restructuring charges   $ 67          
Restructuring charges, after tax   44          
Tax Year 2015              
Quarterly Financial Information [Line Items]              
Recognized tax benefit for the impact of the tax credit   $ 71          
Tax Year 2014              
Quarterly Financial Information [Line Items]              
Recognized tax benefit for the impact of the tax credit     $ 45     $ 45  
[1] The impairment in 2014 relates to our Technical Services reporting unit within our IS&GS business segment (Note 1).
[2] We recognized non-cash goodwill impairment charges related to the Technical Services reporting unit within our MFC business segment in 2014 and 2013. See Note 1 for more information.