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Schedule of Restructuring Costs (Detail) - 2014-2018 Restructuring Program - USD ($)
$ in Millions
3 Months Ended 35 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]      
Balance at beginning of period $ 464    
Charges 157 $ 139 $ 1,856 [1]
Cash spent (84) (74)  
Non-cash settlements/adjustments (72) $ (52)  
Currency 8    
Balance at end of period 473   473
Severance and Related Costs      
Restructuring Cost and Reserve [Line Items]      
Balance at beginning of period 464    
Charges 86    
Cash spent (84)    
Non-cash settlements/adjustments (1)    
Currency 8    
Balance at end of period 473   $ 473
Asset Write-Downs      
Restructuring Cost and Reserve [Line Items]      
Charges 71    
Non-cash settlements/adjustments $ (71)    
[1] Includes all charges recorded since program inception on May 6, 2014 through March 31, 2017.