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Restructuring - Charges Related to Restructuring Program Activities by Type of Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs $ 180 $ 212 $ 605 $ 759
Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 100 61 302 172
Accelerated Depreciation        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 6 33 61 210
Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 74 118 242 377
Materials and production        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 25 36 121 149
Materials and production | Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 0 0 0 0
Materials and production | Accelerated Depreciation        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 5 18 52 69
Materials and production | Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 20 18 69 80
Marketing and administrative        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 0 1 3 91
Marketing and administrative | Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 0 0 0 0
Marketing and administrative | Accelerated Depreciation        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 0 1 2 8
Marketing and administrative | Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 0 0 1 83
Research and development        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 2 14 11 133
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 1 14 7 133
Research and development | Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 1 0 4 0
Restructuring costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 153 161 470 386
Restructuring costs | Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 100 61 302 172
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 $ 53 $ 100 $ 168 $ 214