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Restructuring - Charges Related to Restructuring Program Activities by Type of Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs $ 215 $ 196
Separation Costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 84 26
Accelerated Depreciation    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 49 80
Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 82 90
Materials and production    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 63 47
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 51 22
Materials and production | Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 12 25
Marketing and administrative    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 1 3
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 0 3
Marketing and administrative | Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 1 0
Research and development    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 0 55
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 (2) 55
Research and development | Other    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 2 0
Restructuring costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 151 91
Restructuring costs | Separation Costs    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs 84 26
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 $ 67 $ 65