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2014-2018 Restructuring Program - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 29 Months Ended
Aug. 31, 2016
May 06, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]                
Capital expenditures         $ 909 $ 1,178    
2014-2018 Restructuring Program                
Restructuring Cost and Reserve [Line Items]                
Approved restructuring program cost $ 5,700 $ 3,500            
Reallocation of previously approved capital expenditures to be spent on restructuring program cash costs 600              
Restructuring and related cost, cost incurred     $ 301 $ 221 766 627 $ 2,149 [1]  
Restructuring charges     187 146 480 442 1,465 [1]  
Cash spent     89 51 249 156    
Non-cash settlements     120 56 244 196    
Restructuring reserve     389   389   389 $ 395
Implementation Costs     114 75 286 185 684 [1]  
2014-2018 Restructuring Program | Maximum                
Restructuring Cost and Reserve [Line Items]                
Capital expenditures 1,600 2,200            
2014-2018 Restructuring Program | Selling, general and administrative expenses                
Restructuring Cost and Reserve [Line Items]                
Implementation Costs     114 $ 75 286 $ 185    
2014-2018 Restructuring Program | Other current liabilities                
Restructuring Cost and Reserve [Line Items]                
Restructuring reserve     302   302   302  
2014-2018 Restructuring Program | Other liabilities                
Restructuring Cost and Reserve [Line Items]                
Restructuring reserve     $ 87   $ 87   $ 87  
2014-2018 Restructuring Program | Cash Expense                
Restructuring Cost and Reserve [Line Items]                
Approved restructuring program cost 3,100 2,500            
2014-2018 Restructuring Program | Non Cash Expense                
Restructuring Cost and Reserve [Line Items]                
Approved restructuring program cost   $ 1,000            
2014-2018 Restructuring Program | Cash Outlays                
Restructuring Cost and Reserve [Line Items]                
Approved restructuring program cost $ 4,700              
[1] Includes all charges recorded since program inception on May 6, 2014 through September 30, 2016.