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Schedule of Restructuring Costs (Detail) - 2014-2018 Restructuring Program - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 29 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]          
Balance at beginning of period     $ 395    
Charges $ 187 $ 146 480 $ 442 $ 1,465 [1]
Cash spent (89) (51) (249) (156)  
Non-cash settlements / adjustments (120) $ (56) (244) $ (196)  
Currency     7    
Balance at end of period 389   389   389
Severance and Related Costs          
Restructuring Cost and Reserve [Line Items]          
Balance at beginning of period     395    
Charges     246    
Cash spent     (249)    
Non-cash settlements / adjustments     (10)    
Currency     7    
Balance at end of period $ 389   389   $ 389
Asset Write-Downs          
Restructuring Cost and Reserve [Line Items]          
Charges     234    
Non-cash settlements / adjustments     $ (234)    
[1] Includes all charges recorded since program inception on May 6, 2014 through September 30, 2016.