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Restructuring - Charges Related to Restructuring Program Activities by Type of Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 927 $ 1,069 $ 1,110
Materials and production      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 138 181 361
Marketing and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 2 95 78
Research and development      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 11 142 52
Restructuring costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 776 651 619
Separation Costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 552 216 208
Separation Costs | Materials and production      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0 0 0
Separation Costs | Marketing and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0 0 0
Separation Costs | Research and development      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0 0 0
Separation Costs | Restructuring costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 552 216 208
Accelerated Depreciation      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 60 227 174
Accelerated Depreciation | Materials and production      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 52 77 78
Accelerated Depreciation | Marketing and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 2 8 59
Accelerated Depreciation | Research and development      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 6 142 37
Accelerated Depreciation | Restructuring costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0 0 0
Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 315 626 728
Other | Materials and production      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 86 104 283
Other | Marketing and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0 87 19
Other | Research and development      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 5 0 15
Other | Restructuring costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 224 $ 435 $ 411