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2014-2018 Restructuring Program - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 38 Months Ended
Aug. 31, 2016
May 06, 2014
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]                
Capital expenditures         $ 488 $ 604    
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 $ 228 422 465 $ 2,891 [1]  
Restructuring charges     148 154 305 293 2,004 [1]  
Cash spent     78 86 162 160    
Non-cash asset write-downs     54 72 126 124    
Restructuring reserve     500   500   500 $ 464
Implementation Costs     63 74 117 172 887 [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     63 $ 74 117 $ 172    
2014-2018 Restructuring Program | Other current liabilities                
Restructuring Cost and Reserve [Line Items]                
Restructuring reserve     435   435   435  
2014-2018 Restructuring Program | Other liabilities                
Restructuring Cost and Reserve [Line Items]                
Restructuring reserve     $ 65   $ 65   $ 65  
[1] Includes all charges recorded since program inception on May 6, 2014 through June 30, 2017.