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Restructuring Program - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 59 Months Ended
Sep. 06, 2018
Aug. 31, 2016
May 06, 2014
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
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       $ 70 $ 114 $ 3,962 [1]  
Restructuring charges       20 52 2,570 [1]  
Cash spent in restructuring       (53)      
Non-cash asset write-downs       (29) [2] (25)    
Restructuring reserve       307   307 $ 373
Implementation costs       50 62 1,392 [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       261   261  
Simplify to Grow Program | Other liabilities              
Restructuring Cost and Reserve [Line Items]              
Restructuring reserve       46   46  
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       15      
Cash spent in restructuring       (53) $ (79)    
Non-cash asset write-downs [2]       (24)      
Restructuring reserve       $ 307   $ 307 $ 373
[1] Includes all charges recorded since program inception on May 6, 2014 through March 31, 2019.
[2] During 2019 and 2018, our North America region implementation costs included incremental costs that we incurred related to renegotiating collective bargaining agreements that expired in February 2016 for eight U.S. facilities and related to executing business continuity plans for the North America business.