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Schedule of Restructuring Costs (Detail) - 2014-2018 Restructuring Program - USD ($)
$ in Millions
 12 Months Ended 44 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]        
Balance at beginning of period $ 464 $ 395    
Charges 535 714 $ 711 $ 2,234 [1]
Cash spent (347) (315)    
Non-cash settlements/adjustments (215) (321)    
Currency 27 (9)    
Balance at end of period 464 464 395 464
Severance and Related Costs        
Restructuring Cost and Reserve [Line Items]        
Balance at beginning of period 464 395    
Charges 323 402    
Cash spent (347) (315)    
Non-cash settlements/adjustments (3) (9)    
Currency 27 (9)    
Balance at end of period 464 464 395 464
Asset Write-Downs        
Restructuring Cost and Reserve [Line Items]        
Balance at beginning of period 0 0    
Charges 212 312    
Cash spent 0 0    
Non-cash settlements/adjustments (212) (312)    
Currency 0 0    
Balance at end of period $ 0 $ 0 $ 0 $ 0
[1] Includes all charges recorded since program inception on May 6, 2014 through December 31, 2017.