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Restructuring - Charges Related to Restructuring Program Activities by Type of Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs $ 187 $ 104
Separation Costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 128 55
Accelerated Depreciation    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 34 (2)
Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 25 51
Cost of sales    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 34 6
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 34 0
Cost of sales | Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0 6
Selling, general and administrative    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0 1
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 0 1
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 0 2
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 0 (3)
Research and development | Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0 5
Restructuring costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 153 95
Restructuring costs | Separation Costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 128 55
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 $ 40