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Restructuring Program - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 53 Months Ended
Sep. 06, 2018
Aug. 31, 2016
May 06, 2014
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Dec. 31, 2017
2014-2018 Restructuring Program                  
Restructuring Cost and Reserve [Line Items]                  
Approved restructuring program cost   $ 5,700 $ 3,500            
Reallocation of previously approved capital expenditures to be spent on restructuring program cash costs   600              
2014-2018 Restructuring Program | Maximum                  
Restructuring Cost and Reserve [Line Items]                  
Approved capital expenditures   1,600 $ 2,200            
2014-2018 Restructuring Program | Restructuring Program Charges                  
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              
Simplify to Grow Program                  
Restructuring Cost and Reserve [Line Items]                  
Approved restructuring program cost $ 7,700                
Restructuring and implementation charges       $ 139 $ 175 $ 435 $ 597 $ 3,696  
Restructuring charges       56 113 220 418 2,454 [1]  
Cash spent in restructuring           232      
Non-cash asset write-downs       9 48 48 174    
Restructuring reserve       376   376   376 $ 464
Implementation costs       83 62 215 179 1,242 [1]  
Simplify to Grow Program | Maximum                  
Restructuring Cost and Reserve [Line Items]                  
Approved capital expenditures 2,300                
Increase in approved restructuring program costs 1,300                
Increase in approved capital expenditures 700                
Simplify to Grow Program | Other current liabilities                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring reserve       308   308   308  
Simplify to Grow Program | Other liabilities                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring reserve       68   68   68  
Simplify to Grow Program | Restructuring Program Charges                  
Restructuring Cost and Reserve [Line Items]                  
Approved restructuring program cost 5,400                
Simplify to Grow Program | Cash Costs                  
Restructuring Cost and Reserve [Line Items]                  
Approved restructuring program cost 4,100                
Simplify to Grow Program | Non-cash Costs                  
Restructuring Cost and Reserve [Line Items]                  
Approved restructuring program cost $ 1,300                
Simplify to Grow Program | Severance and Related Costs                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring charges           175      
Cash spent in restructuring       70 $ 83 232 $ 245    
Non-cash asset write-downs           3      
Restructuring reserve       $ 376   $ 376   $ 376 $ 464
[1] Includes all charges recorded since program inception on May 6, 2014 through September 30, 2018.