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2014-2018 Restructuring Program - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended 44 Months Ended
Aug. 31, 2016
May 06, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]            
Capital expenditures     $ 1,014 $ 1,224 $ 1,514  
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     792 1,086 1,002 $ 3,261 [1]
Restructuring charges     535 714 711 2,234 [1]
Cash spent     347 315    
Non-cash asset write-downs     215 321    
Restructuring reserve     464 464 395 464
Implementation Costs     257 372 291 1,027 [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     257 $ 372 $ 291  
2014-2018 Restructuring Program | Other current liabilities            
Restructuring Cost and Reserve [Line Items]            
Restructuring reserve     412     412
2014-2018 Restructuring Program | Other liabilities            
Restructuring Cost and Reserve [Line Items]            
Restructuring reserve     $ 52     $ 52
[1] Includes all charges recorded since program inception on May 6, 2014 through December 31, 2017.