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Restructuring - Charges Related to Restructuring Program Activities by Type of Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 927 $ 658 $ 927
Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 251 21 138
Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 34 3 2
Research and development      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 4 2 11
Restructuring costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 638 632 776
Separation Costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 572 473 552
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 572 473 552
Accelerated Depreciation      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 233 (1) 60
Accelerated Depreciation | Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 198 10 52
Accelerated Depreciation | Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 33 2 2
Accelerated Depreciation | Research and development      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 2 (13) 6
Accelerated Depreciation | Restructuring costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0 0 0
Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 122 186 315
Other | Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 53 11 86
Other | Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 1 1 0
Other | Research and development      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 2 15 5
Other | Restructuring costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 66 $ 159 $ 224