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Restructuring - Charges Related to Restructuring Program Activities by Type of Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs $ 159 $ 235 $ 346 $ 339
Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 25 200 153 255
Accelerated Depreciation        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 98 0 132 (2)
Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 36 35 61 86
Cost of sales        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 65 3 99 9
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 64 0 98 0
Cost of sales | Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 1 3 1 9
Selling, general and administrative        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 32 1 32 2
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 32 0 32 1
Selling, general and administrative | Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 0 1 0 1
Research and development        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 3 3 3 5
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 2 0 2 (3)
Research and development | Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 1 3 1 8
Restructuring costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 59 228 212 323
Restructuring costs | Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 25 200 153 255
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 $ 34 $ 28 $ 59 $ 68