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Restructuring - Charges Related to Restructuring Program Activities by Type of Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 883 $ 927 $ 658
Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 175 251 21
Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 47 34 3
Research and development      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 83 4 2
Restructuring costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 578 638 632
Separation Costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 385 572 473
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 385 572 473
Accelerated Depreciation      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 268 233 (1)
Accelerated Depreciation | Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 143 198 10
Accelerated Depreciation | Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 44 33 2
Accelerated Depreciation | Research and development      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 81 2 (13)
Accelerated Depreciation | Restructuring costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0 0 0
Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 230 122 186
Other | Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 32 53 11
Other | Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 3 1 1
Other | Research and development      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 2 2 15
Other | Restructuring costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 193 $ 66 $ 159