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2014-2018 Restructuring Program - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 41 Months Ended
Aug. 31, 2016
May 06, 2014
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]                
Capital expenditures         $ 721 $ 909    
2014-2018 Restructuring Program                
Restructuring Cost and Reserve [Line Items]                
Approved restructuring program cost $ 5,700              
Reallocation of previously approved capital expenditures to be spent on restructuring program cash costs 600              
Restructuring and related cost, cost incurred     $ 175 $ 301 597 766 $ 3,065 [1]  
Restructuring charges     113 187 418 480 2,117 [1]  
Cash spent     83 89 245 249    
Non-cash asset write-downs     48 120 174 244    
Restructuring reserve     493   493   493 $ 464
Implementation Costs     62 114 179 286 948 [1]  
2014-2018 Restructuring Program | Maximum                
Restructuring Cost and Reserve [Line Items]                
Capital expenditures 1,600 $ 2,200            
2014-2018 Restructuring Program | Restructuring Program Costs                
Restructuring Cost and Reserve [Line Items]                
Approved restructuring program cost 4,100 $ 3,500            
2014-2018 Restructuring Program | Cash Expense                
Restructuring Cost and Reserve [Line Items]                
Approved restructuring program cost 3,100              
2014-2018 Restructuring Program | Non Cash Expense                
Restructuring Cost and Reserve [Line Items]                
Approved restructuring program cost $ 1,000              
2014-2018 Restructuring Program | Selling, general and administrative expenses                
Restructuring Cost and Reserve [Line Items]                
Implementation Costs     62 $ 114 179 $ 286    
2014-2018 Restructuring Program | Other current liabilities                
Restructuring Cost and Reserve [Line Items]                
Restructuring reserve     431   431   431  
2014-2018 Restructuring Program | Other liabilities                
Restructuring Cost and Reserve [Line Items]                
Restructuring reserve     $ 62   $ 62   $ 62  
[1] Includes all charges recorded since program inception on May 6, 2014 through September 30, 2017.