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Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Limited partnerships and other equity method investments $ 24 $ 58 $ 24  
Other equity investments without readily determinable fair values 82 204 82  
Unrealized loss on investment of equity securities   1,700    
Unrealized gain on investment of equity securities     1,200  
Short-term and long-term debt 24,593 31,402 24,593  
In-process research and development impairment 800 0 800 $ 820
Fair value | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short-term and long-term debt 27,300 34,600 27,300  
Fair Value | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short-term and long-term debt $ 24,600 $ 30,300 $ 24,600