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Benefit Plans - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Asset impairment and exit costs        
Defined Benefit Plan Disclosure [Line Items]        
Settlement losses/(gains) and other expenses $ 11 $ 9 $ 11 $ 9
U.S. Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Settlement losses/(gains) and other expenses 18 12 21 16
Employer contribution     9  
Estimated future employer contributions 4   4  
Non-U.S. Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Settlement losses/(gains) and other expenses 1 $ (1) 2 $ (1)
Employer contribution     369  
Employer non-recurring contribution     250  
Estimated future employer contributions $ 86   $ 86