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Restructuring Programs - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 26 Months Ended
May 06, 2014
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]              
Capital expenditures       $ 604 $ 790    
2014-2018 Restructuring Program              
Restructuring Cost and Reserve [Line Items]              
Approved restructuring program cost $ 3,500            
Restructuring and related cost, cost incurred   $ 228 $ 182 465 406 $ 1,848 [1]  
Restructuring charges   154 135 293 297 1,278 [1]  
Cash spent   86 66 160 105    
Non-cash settlements   72 62 124 140    
Restructuring reserve   411   411   411 $ 395
Implementation costs   74 47 172 109 570 [1]  
2014-2018 Restructuring Program | Maximum              
Restructuring Cost and Reserve [Line Items]              
Capital expenditures 2,200            
2014-2018 Restructuring Program | Selling, general and administrative expenses              
Restructuring Cost and Reserve [Line Items]              
Implementation costs   74 $ 47 172 $ 109    
2014-2018 Restructuring Program | Other current liabilities              
Restructuring Cost and Reserve [Line Items]              
Restructuring reserve   335   335   335  
2014-2018 Restructuring Program | Other liabilities              
Restructuring Cost and Reserve [Line Items]              
Restructuring reserve   $ 76   $ 76   $ 76  
2014-2018 Restructuring Program | Cash Expense              
Restructuring Cost and Reserve [Line Items]              
Approved restructuring program cost 2,500            
2014-2018 Restructuring Program | Non Cash Expense              
Restructuring Cost and Reserve [Line Items]              
Approved restructuring program cost $ 1,000            
[1] Includes all charges recorded since program inception on May 6, 2014 through June 30, 2016.