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2014-2018 Restructuring Program - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 50 Months Ended
Aug. 31, 2016
May 06, 2014
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]                  
Approved capital expenditures         $ 532 $ 488      
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     $ 182 $ 211 296 422 $ 3,557 [1]    
Restructuring charges     112 148 164 305 2,398 [1]    
Cash spent in restructuring         161        
Non-cash asset write-downs     14 54 39 126      
Restructuring reserve     404   404   404   $ 464
Implementation Costs     70 63 132 117 1,159 [1]    
2014-2018 Restructuring Program | Maximum                  
Restructuring Cost and Reserve [Line Items]                  
Approved capital expenditures 1,600 $ 2,200              
2014-2018 Restructuring Program | Other current liabilities                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring reserve     323   323   323    
2014-2018 Restructuring Program | Other liabilities                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring reserve     81   81   81    
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 | Restructuring Program Costs | Scenario, Forecast                  
Restructuring Cost and Reserve [Line Items]                  
Approved restructuring program cost               $ 4,100  
2014-2018 Restructuring Program | Cash Costs                  
Restructuring Cost and Reserve [Line Items]                  
Approved restructuring program cost 3,100                
2014-2018 Restructuring Program | Non-cash Costs                  
Restructuring Cost and Reserve [Line Items]                  
Approved restructuring program cost $ 1,000                
2014-2018 Restructuring Program | Severance and related costs                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring charges         125        
Cash spent in restructuring     82 $ 78 161 $ 162      
Non-cash asset write-downs         0        
Restructuring reserve     $ 404   $ 404   $ 404   $ 464
[1] Includes all charges recorded since program inception on May 6, 2014 through June 30, 2018.