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Restructuring Program - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 98 Months Ended
Sep. 06, 2018
Aug. 31, 2016
May 06, 2014
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Dec. 31, 2021
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       $ 23 $ 133 $ 54 $ 255 $ 5,078  
Restructuring charges       4 100 15 188 3,051  
Cash spent in restructuring           33      
Non-cash asset write-downs       7   9 116    
Gain on sale of property         76        
Restructuring reserve       174   174   174 $ 211
Implementation costs       19 33 39 67 2,027  
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       119   119   119  
Simplify to Grow Program | Other liabilities                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring reserve       55   55   55  
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           8      
Cash spent in restructuring       16 $ 30 33 $ 64    
Non-cash asset write-downs           2      
Restructuring reserve       $ 174   $ 174   $ 174 $ 211