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Restructuring - Charges Related to Restructuring Program Activities by Type of Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs $ 104 $ 215
Separation Costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 55 84
Accelerated Depreciation    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs (2) 49
Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 51 82
Materials and production    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 6 63
Materials and production | Separation Costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0 0
Materials and production | Accelerated Depreciation    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0 51
Materials and production | Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 6 12
Marketing and administrative    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 1 1
Marketing and administrative | Separation Costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0 0
Marketing and administrative | Accelerated Depreciation    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 1 0
Marketing and administrative | Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0 1
Research and development    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 2 0
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 (3) (2)
Research and development | Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 5 2
Restructuring costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 95 151
Restructuring costs | Separation Costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 55 84
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 $ 40 $ 67