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Restructuring - Charges Activities by Type of Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs $ 335 $ 168
Separation Costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 229 47
Accelerated Depreciation    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 20 53
Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 86 68
Cost of sales    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 27 68
Cost of sales | Separation Costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0 0
Cost of sales | Accelerated Depreciation    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 10 25
Cost of sales | Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 17 43
Selling, general and administrative    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 3 11
Selling, general and administrative | Separation Costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0 0
Selling, general and administrative | Accelerated Depreciation    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 3 11
Selling, general and administrative | Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0 0
Research and development    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 7 17
Research and development | Separation Costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0 0
Research and development | Accelerated Depreciation    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 7 17
Research and development | Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0 0
Restructuring costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 298 72
Restructuring costs | Separation Costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 229 47
Restructuring costs | Accelerated Depreciation    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0 0
Restructuring costs | Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs $ 69 $ 25