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Restructuring - Charges Activities by Type of Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs $ 168 $ 187
Separation Costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 47 128
Accelerated Depreciation    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 53 34
Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 68 25
Cost of sales    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 68 34
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 25 34
Cost of sales | Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 43 0
Selling, general and administrative    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 11  
Selling, general and administrative | Separation Costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0  
Selling, general and administrative | Accelerated Depreciation    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 11  
Selling, general and administrative | Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0  
Research and development    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 17  
Research and development | Separation Costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0  
Research and development | Accelerated Depreciation    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 17  
Research and development | Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0  
Restructuring costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 72 153
Restructuring costs | Separation Costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 47 128
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 $ 25 $ 25