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Restructuring - Charges Activities by Type of Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs $ 168 $ 185 $ 630 $ 500
Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 17 61 310 143
Accelerated Depreciation        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 22 66 60 192
Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 129 58 260 165
Cost of sales        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 48 38 113 131
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 33 32 89
Cost of sales | Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 37 5 81 42
Selling, general and administrative        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 5 15 9 37
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 4 15 8 37
Selling, general and administrative | Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 1 0 1 0
Research and development        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 8 19 21 67
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 7 18 20 66
Research and development | Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 1 1 1 1
Restructuring costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 107 113 487 265
Restructuring costs | Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 17 61 310 143
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 $ 90 $ 52 $ 177 $ 122