v3.20.4
Fair Value Measurements - Additional Information (Details)
Dec. 31, 2020
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Fair value assets transferred from level 1 to level 2 $ 0
Fair value assets transferred from level 2 to level 1 0
Fair value liabilities transferred from level 1 to level 2 0
Fair value liabilities transferred from level 2 to level 1 0
Level 2 Securities | 2025 Notes  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Convertible notes 2,400,000,000
Level 2 Securities | 2026 Notes  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Convertible notes $ 2,800,000,000