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Restructuring - Charges Related to Restructuring Program Activities by Type of Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 658 $ 927 $ 1,069
Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 21 138 181
Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 3 2 95
Research and development      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 2 11 142
Restructuring costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 632 776 651
Separation Costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 473 552 216
Separation Costs | Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0 0 0
Separation Costs | Selling, general 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 473 552 216
Accelerated Depreciation      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs (1) 60 227
Accelerated Depreciation | Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 10 52 77
Accelerated Depreciation | Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 2 2 8
Accelerated Depreciation | Research and development      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs (13) 6 142
Accelerated Depreciation | Restructuring costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0 0 0
Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 186 315 626
Other | Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 11 86 104
Other | Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 1 0 87
Other | Research and development      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 15 5 0
Other | Restructuring costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 159 $ 224 $ 435