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Schedule of Restructuring Costs (Detail) - USD ($)
$ in Millions
12 Months Ended 20 Months Ended 36 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
2012-2014 Restructuring Program          
Restructuring Cost and Reserve [Line Items]          
Balance at beginning of period $ 128 $ 68      
Charges (4) 360 $ 267   $ 729 [1]
Cash spent (66) (130)      
Non-cash settlements / adjustments (4) (161)      
Currency (7) (9)      
Balance at end of period 47 128 68 $ 47 128
2014-2018 Restructuring Program          
Restructuring Cost and Reserve [Line Items]          
Balance at beginning of period 224        
Charges 711 274   985 [2]  
Cash spent (243) (17)      
Non-cash settlements / adjustments (273) (28)      
Currency (24) (5)      
Balance at end of period 395 224   395 224
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 128 68      
Charges (4) 201      
Cash spent (66) (130)      
Non-cash settlements / adjustments (4) (2)      
Currency (7) (9)      
Balance at end of period 47 128 $ 68 47 128
Severance and Related Costs | 2014-2018 Restructuring Program          
Restructuring Cost and Reserve [Line Items]          
Balance at beginning of period 224        
Charges 442 251      
Cash spent (243) (17)      
Non-cash settlements / adjustments (4) (5)      
Currency (24) (5)      
Balance at end of period 395 224   $ 395 $ 224
Asset Write-Downs | 2012-2014 Restructuring Program          
Restructuring Cost and Reserve [Line Items]          
Charges   159      
Non-cash settlements / adjustments   (159)      
Asset Write-Downs | 2014-2018 Restructuring Program          
Restructuring Cost and Reserve [Line Items]          
Charges 269 23      
Non-cash settlements / adjustments $ (269) $ (23)      
[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, 2015.