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Investments in Affiliated Companies - Additional Information (Detail)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Business-Combination
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]      
Impairment charges for equity method investments   $ 17 $ 0
Sales to equity method investees   $ 284 214
Hubei Aviation Precision Machinery Co., Ltd [Member]      
Schedule of Equity Method Investments [Line Items]      
Proceeds from transfer of operations $ 54    
Hubei Aviation Precision Machinery Co., Ltd [Member] | Other Nonoperating Income (Expense) [Member]      
Schedule of Equity Method Investments [Line Items]      
Gain on deconsolidation of manufacturing operation 45    
Gain on deconsolidation of manufacturing operation, after tax $ 34    
Corporate Joint Venture [Member]      
Schedule of Equity Method Investments [Line Items]      
Percentage of ownership by company 49.90% 49.90%  
Hubei Aviation Precision Machinery Co., Ltd [Member] | Corporate Joint Venture [Member]      
Schedule of Equity Method Investments [Line Items]      
Percentage of ownership by other 50.10% 50.10%  
Getrag Group Of Companies [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of investees, determined as variable interest entities | Business-Combination   2  
Variable interest entities, maximum exposure to any potential losses $ 139 $ 139 $ 187