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Restructuring Program - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 86 Months Ended
Sep. 06, 2018
Aug. 31, 2016
May 06, 2014
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
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       $ 133 $ 80 $ 255 $ 138 $ 4,958  
Restructuring charges       100 28 188 43 3,070  
Cash spent in restructuring           64      
Non-cash asset write-downs       76 11 116 14    
Restructuring reserve       307   307   307 $ 304
Implementation costs       33 52 67 95 1,888  
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       258   258   258  
Simplify to Grow Program | Other liabilities                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring reserve       49   49   49  
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           73      
Cash spent in restructuring       30 $ 32 64 $ 69    
Non-cash asset write-downs           1      
Restructuring reserve       $ 307   $ 307   $ 307 $ 304