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Schedule of Restructuring Costs (Detail) - 2014-2018 Restructuring Program - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 26 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]          
Balance at beginning of period     $ 395    
Charges $ 154 $ 135 293 $ 297 $ 1,278 [1]
Cash spent (86) (66) (160) (105)  
Non-cash settlements / adjustments (72) $ (62) (124) $ (140)  
Currency     7    
Balance at end of period 411   411   411
Severance and Related Costs          
Restructuring Cost and Reserve [Line Items]          
Balance at beginning of period     395    
Charges     179    
Cash spent     (160)    
Non-cash settlements / adjustments     (10)    
Currency     7    
Balance at end of period 411   411   411
Asset Write-Downs          
Restructuring Cost and Reserve [Line Items]          
Balance at beginning of period     0    
Charges     114    
Non-cash settlements / adjustments     (114)    
Balance at end of period $ 0   $ 0   $ 0
[1] Includes all charges recorded since program inception on May 6, 2014 through June 30, 2016.