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Schedule of Restructuring Costs (Detail) - USD ($)
$ in Millions
 12 Months Ended 32 Months Ended 36 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2014
2012-2014 Restructuring Program          
Restructuring Cost and Reserve [Line Items]          
Balance at beginning of period $ 47 $ 128      
Charges   (4) $ 360   $ 729 [1]
Cash spent (21) (66)      
Non-cash settlements / adjustments (6) (4)      
Currency (1) (7)      
Balance at end of period 19 47 128 $ 19 128
2014-2018 Restructuring Program          
Restructuring Cost and Reserve [Line Items]          
Balance at beginning of period 395 224      
Charges 714 711 274 1,699 [2]  
Cash spent (315) (243)      
Non-cash settlements / adjustments (321) (273)      
Currency (9) (24)      
Balance at end of period 464 395 224 464 224
Severance and Related Costs          
Restructuring Cost and Reserve [Line Items]          
Charges     73    
Severance and Related Costs | 2012-2014 Restructuring Program          
Restructuring Cost and Reserve [Line Items]          
Balance at beginning of period 47 128      
Charges   (4)      
Cash spent (21) (66)      
Non-cash settlements / adjustments (6) (4)      
Currency (1) (7)      
Balance at end of period 19 47 128 19 128
Severance and Related Costs | 2014-2018 Restructuring Program          
Restructuring Cost and Reserve [Line Items]          
Balance at beginning of period 395 224      
Charges 402 442      
Cash spent (315) (243)      
Non-cash settlements / adjustments (9) (4)      
Currency (9) (24)      
Balance at end of period 464 395 $ 224 $ 464 $ 224
Asset Write-Downs | 2014-2018 Restructuring Program          
Restructuring Cost and Reserve [Line Items]          
Charges 312 269      
Non-cash settlements / adjustments $ (312) $ (269)      
[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 December 31, 2016.