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Schedule of Restructuring Costs (Detail) - 2014-2018 Restructuring Program - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 38 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]          
Balance at beginning of period     $ 464    
Charges $ 148 $ 154 305 $ 293 $ 2,004 [1]
Cash spent (78) (86) (162) (160)  
Non-cash settlements/adjustments (54) $ (72) (126) $ (124)  
Currency     19    
Balance at end of period 500   500   500
Severance and Related Costs          
Restructuring Cost and Reserve [Line Items]          
Balance at beginning of period     464    
Charges     184    
Cash spent     (162)    
Non-cash settlements/adjustments     (5)    
Currency     19    
Balance at end of period $ 500   500   $ 500
Asset Write-Downs          
Restructuring Cost and Reserve [Line Items]          
Charges     121    
Non-cash settlements/adjustments     $ (121)    
[1] Includes all charges recorded since program inception on May 6, 2014 through June 30, 2017.