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Schedule of Restructuring Costs (Detail) - 2014-2018 Restructuring Program - USD ($)
$ in Millions
3 Months Ended 23 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]      
Balance at beginning of period $ 395    
Charges 139 $ 163 $ 1,124 [1]
Cash spent (74) (39)  
Non-cash settlements / adjustments (52) $ (78)  
Currency 10    
Balance at end of period 418   418
Severance and Related Costs      
Restructuring Cost and Reserve [Line Items]      
Balance at beginning of period 395    
Charges 87    
Cash spent (74)    
Currency 10    
Balance at end of period 418   418
Asset Write-Downs      
Restructuring Cost and Reserve [Line Items]      
Balance at beginning of period 0    
Charges 52    
Non-cash settlements / adjustments (52)    
Balance at end of period $ 0   $ 0
[1] Includes all charges recorded since program inception on May 6, 2014 through March 31, 2016.