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Restructuring Programs - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 23 Months Ended
May. 06, 2014
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]          
Capital expenditures   $ 335 $ 439    
2014-2018 Restructuring Program          
Restructuring Cost and Reserve [Line Items]          
Approved restructuring program cost $ 3,500        
Restructuring and related cost, cost incurred   237 224 $ 1,620 [1]  
Restructuring charges   139 163 1,124 [1]  
Cash spent   74 39    
Non-cash settlements   52 78    
Restructuring reserve   418   418 $ 395
Implementation costs   98 61 496 [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   98 $ 61    
2014-2018 Restructuring Program | Other current liabilities          
Restructuring Cost and Reserve [Line Items]          
Restructuring reserve   332   332  
2014-2018 Restructuring Program | Other liabilities          
Restructuring Cost and Reserve [Line Items]          
Restructuring reserve   $ 86   $ 86  
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 March 31, 2016.