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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs $ 169 $ 180 $ 508 $ 605
Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 137 100 392 302
Accelerated Depreciation        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs (8) 6 (10) 61
Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 40 74 126 242
Materials and production        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 2 25 11 121
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 1 5 1 52
Materials and production | Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 1 20 10 69
Marketing and administrative        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 0 0 2 3
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 0 1 2
Marketing and administrative | Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 0 0 1 1
Research and development        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs (4) 2 1 11
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 (9) 1 (12) 7
Research and development | Other        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 5 1 13 4
Restructuring costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 171 153 494 470
Restructuring costs | Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs 137 100 392 302
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 $ 53 $ 102 $ 168