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Acquisitions - Summary of Amounts Recognized for Assets and Liabilities Acquired (Detail) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Net cash outflow     $ 1,930 $ 222
Getrag Group Of Companies [Member]        
Business Acquisition [Line Items]        
Cash   $ 136 136  
Non-cash working capital   (395) (395)  
Investments   1,497 1,497  
Fixed assets   445 445  
Goodwill   590 590  
Other assets   24 24  
Intangibles   372 372  
Deferred tax assets   34 34  
Long-term employee benefit liabilities   (137) (137)  
Long-term debt   (117) (117)  
Other long-term liabilities   (52) (52)  
Deferred tax liabilities   (119) (119)  
Non-controlling interest   (287) (287)  
Consideration paid   1,991    
Less: Cash acquired   (136)    
Net cash outflow   1,855    
Getrag Group Of Companies [Member] | Preliminary amounts recognized [Member]        
Business Acquisition [Line Items]        
Cash $ 136      
Non-cash working capital (466)      
Investments 1,719      
Fixed assets 468      
Goodwill 430      
Other assets 60      
Intangibles 218      
Deferred tax assets 43      
Long-term employee benefit liabilities (125)      
Long-term debt (116)      
Other long-term liabilities (9)      
Deferred tax liabilities (137)      
Non-controlling interest (303)      
Consideration paid 1,918      
Less: Cash acquired (136)      
Net cash outflow $ 1,782      
Getrag Group Of Companies [Member] | Measurement Period adjustments [Member]        
Business Acquisition [Line Items]        
Non-cash working capital   71 71  
Investments   (222) (222)  
Fixed assets   (23) (23)  
Goodwill   160 160  
Other assets   (36) (36)  
Intangibles   154 154  
Deferred tax assets   (9) (9)  
Long-term employee benefit liabilities   (12) (12)  
Long-term debt   (1) (1)  
Other long-term liabilities   (43) (43)  
Deferred tax liabilities   18 18  
Non-controlling interest   16 $ 16  
Consideration paid   73    
Net cash outflow   $ 73