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2014-2018 Restructuring Program - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 35 Months Ended
Aug. 31, 2016
May 06, 2014
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]            
Capital expenditures     $ 306 $ 335    
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     211 237 $ 2,680 [1]  
Restructuring charges     157 139 1,856 [1]  
Cash spent     84 74    
Non-cash asset write-downs     72 52    
Restructuring reserve     473   473 $ 464
Implementation Costs     54 98 824 [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 2,500        
2014-2018 Restructuring Program | Non Cash Expense            
Restructuring Cost and Reserve [Line Items]            
Approved restructuring program cost 1,000 $ 1,000        
2014-2018 Restructuring Program | Cash Outlays            
Restructuring Cost and Reserve [Line Items]            
Approved restructuring program cost $ 4,700          
2014-2018 Restructuring Program | Selling, general and administrative expenses            
Restructuring Cost and Reserve [Line Items]            
Implementation Costs     54 $ 98    
2014-2018 Restructuring Program | Other current liabilities            
Restructuring Cost and Reserve [Line Items]            
Restructuring reserve     398   398  
2014-2018 Restructuring Program | Other liabilities            
Restructuring Cost and Reserve [Line Items]            
Restructuring reserve     $ 75   $ 75  
[1] Includes all charges recorded since program inception on May 6, 2014 through March 31, 2017.