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Debt - Convertible Senior Notes due in 2021 Narrative (Details)
12 Months Ended
Dec. 01, 2021
USD ($)
shares
May 19, 2020
USD ($)
Oct. 09, 2019
USD ($)
Sep. 09, 2019
USD ($)
Dec. 12, 2016
USD ($)
Dec. 31, 2022
USD ($)
day
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
shares
May 15, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                    
Net proceeds from issuance           $ 0 $ 0 $ 553,000,000    
Shareholders equity           4,482,000,000 5,341,000,000 4,742,000,000   $ 3,435,000,000
Capped call confirmations, portion unwound, value received $ 43,000,000             15,000,000    
Accumulated Deficit                    
Debt Instrument [Line Items]                    
Shareholders equity           (1,612,000,000) (1,667,000,000) $ (1,139,000,000)   $ (977,000,000)
Cumulative-effect adjustment from adoption of guidance on accounting for convertible instruments and contracts in an entity’s own equity                    
Debt Instrument [Line Items]                    
Shareholders equity             (336,000,000)      
Cumulative-effect adjustment from adoption of guidance on accounting for convertible instruments and contracts in an entity’s own equity | Accumulated Deficit                    
Debt Instrument [Line Items]                    
Shareholders equity             $ 156,000,000      
Class C capital stock                    
Debt Instrument [Line Items]                    
Capped call confirmations, portion unwound, shares received (in shares) | shares 700,000             300,000    
Convertible Debt                    
Debt Instrument [Line Items]                    
Debt instrument, face amount           $ 1,672,000,000        
Convertible Senior Notes due 2021, 2.0% | Convertible Debt                    
Debt Instrument [Line Items]                    
Debt instrument, face amount         $ 460,000,000          
Debt instrument, interest rate stated percentage         2.00%          
Net proceeds from issuance         $ 448,000,000          
Net proceeds used to purchase capped call confirmations         37,000,000          
2.0% convertible senior notes due 2021, over-allotment option | Convertible Debt                    
Debt Instrument [Line Items]                    
Debt instrument, face amount         $ 60,000,000          
Convertible Senior Notes Due 2024, 2025, 2026 | Convertible Debt                    
Debt Instrument [Line Items]                    
Repurchase price percentage of principal amount           100.00%        
Debt instrument, convertible threshold percentage           130.00%        
Debt instrument, convertible threshold trading days | day           20        
Debt instrument, threshold consecutive trading days | day           30        
1.375% convertible senior notes due 2026 | Convertible Debt                    
Debt Instrument [Line Items]                    
Debt instrument, face amount       $ 500,000,000   $ 499,000,000        
Debt instrument, interest rate stated percentage           1.375%        
Net proceeds from issuance       494,000,000            
Net proceeds used to purchase capped call confirmations       75,000,000            
2.75% convertible senior notes due 2025 | Convertible Debt                    
Debt Instrument [Line Items]                    
Debt instrument, face amount   $ 65,000,000       $ 565,000,000     $ 500,000,000  
Debt instrument, interest rate stated percentage   2.75%       2.75%     2.75%  
Net proceeds from issuance   $ 553,000,000                
0.75% convertible senior notes due 2024 | Convertible Debt                    
Debt Instrument [Line Items]                    
Debt instrument, face amount     $ 73,000,000 600,000,000   $ 608,000,000        
Debt instrument, interest rate stated percentage     0.75%     0.75%        
Net proceeds from issuance     $ 72,000,000 592,000,000            
Net proceeds used to purchase capped call confirmations     $ 9,000,000 $ 75,000,000