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Schedule of Restructuring Costs (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 17 Months Ended 36 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Dec. 31, 2014
2012-2014 Restructuring Program            
Restructuring Cost and Reserve [Line Items]            
Balance at beginning of period     $ 128      
Charges   $ 163   $ 259   $ 729 [1]
Reversal to restructuring charges     (3)      
Cash spent $ (14) (44) (57) (110)    
Non-cash settlements / adjustments   (53)   (77)    
Currency     (6)      
Balance at end of period 62   62   $ 62 128
2014-2018 Restructuring Program            
Restructuring Cost and Reserve [Line Items]            
Balance at beginning of period     224      
Charges 146 25 442 26 717 [2]  
Cash spent (51) $ (25) (156) $ (26)    
Non-cash settlements / adjustments (56)   (196)      
Currency     (15)      
Balance at end of period 299   299   299 224
Severance and Related Costs | 2012-2014 Restructuring Program            
Restructuring Cost and Reserve [Line Items]            
Balance at beginning of period     128      
Reversal to restructuring charges     (3)      
Cash spent     (57)      
Currency     (6)      
Balance at end of period 62   62   62 128
Severance and Related Costs | 2014-2018 Restructuring Program            
Restructuring Cost and Reserve [Line Items]            
Balance at beginning of period     224      
Charges     252      
Cash spent     (156)      
Non-cash settlements / adjustments     (6)      
Currency     (15)      
Balance at end of period $ 299   299   $ 299 $ 224
Asset Write-Downs | 2014-2018 Restructuring Program            
Restructuring Cost and Reserve [Line Items]            
Charges     190      
Non-cash settlements / adjustments     $ (190)      
[1] Includes all charges recorded since program inception in 2012 through conclusion on December 31, 2014.
[2] Includes all charges recorded since program inception on May 6, 2014 through September 30, 2015.