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Benefit Plans - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
U.S. Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Settlement losses $ 3 $ 4
Employer contribution 3  
Estimated future employer contributions 10  
Non-U.S. Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Employer contribution 307  
Employer non-recurring contribution 250  
Estimated future employer contributions $ 148