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Restructuring - Activities by Program (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     $ 637  
Expense $ 258 $ 128 384 $ 462
(Payments) receipts, net     (447)  
Non-cash activity     14  
Restructuring reserve, ending balance 588   588  
Separation Costs        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     596  
Expense 106 64 132 293
(Payments) receipts, net     (167)  
Non-cash activity     0  
Restructuring reserve, ending balance 561   561  
Accelerated Depreciation        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     0  
Expense 47 19 76 38
(Payments) receipts, net     0  
Non-cash activity     (76)  
Restructuring reserve, ending balance 0   0  
Other        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     41  
Expense 105 $ 45 176 $ 131
(Payments) receipts, net     (280)  
Non-cash activity     90  
Restructuring reserve, ending balance $ 27   $ 27