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Restructuring - Charges Activities by Type of Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs $ 128 $ 149 $ 462 $ 315
Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 64 35 293 82
Accelerated Depreciation        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 19 73 38 126
Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 45 41 131 107
Cost of sales        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 38 25 65 93
Cost of sales | Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 0 0 0 0
Cost of sales | Accelerated Depreciation        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 11 31 21 56
Cost of sales | Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 27 (6) 44 37
Selling, general and administrative        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 2 11 4 22
Selling, general and administrative | Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 0 0 0 0
Selling, general and administrative | Accelerated Depreciation        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 2 11 4 22
Selling, general and administrative | Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 0 0 0 0
Research and development        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 6 31 13 48
Research and development | Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 0 0 0 0
Research and development | Accelerated Depreciation        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 6 31 13 48
Research and development | Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 0 0 0 0
Restructuring costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 82 82 380 152
Restructuring costs | Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 64 35 293 82
Restructuring costs | Accelerated Depreciation        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 0 0 0 0
Restructuring costs | Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs $ 18 $ 47 $ 87 $ 70