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Summary of Significant Accounting Policies - Earnings (Loss) Per Common Share and Recently Issued Accounting Standard (Details) - USD ($)
shares in Thousands, $ in Millions
12 Months Ended
Jan. 12, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2022
Aug. 21, 2020
Earnings per share and New Accounting Principle            
Basic weighted average number of shares outstanding   308,146 272,433 306,400    
Diluted weighted average number of shares outstanding   308,146 272,433 306,400    
Number of shares of common stock issued (in shares) 31,400          
Accounting Standards Update 2020-06 | Adjustment Effect | Subsequent event            
Earnings per share and New Accounting Principle            
Amount expected to be reclassified from additional paid-in capital to long-term debt, deferred income tax liability and accumulated deficit         $ 24  
4.25% convertible senior notes due 2026            
Earnings per share and New Accounting Principle            
Debt repurchased $ 150          
Effective interest rate (as a percent)   15.30%       15.10%
4.25% convertible senior notes due 2026 | Accounting Standards Update 2020-06 | Adjustment Effect | Subsequent event            
Earnings per share and New Accounting Principle            
Effective interest rate (as a percent)         4.90%  
RSUs            
Earnings per share and New Accounting Principle            
Weighted average anti-dilutive awards   6,407 6,810 2,357    
PSUs            
Earnings per share and New Accounting Principle            
Weighted average anti-dilutive awards   2,832 432 1,443    
Stock options            
Earnings per share and New Accounting Principle            
Weighted average anti-dilutive awards   379 327 527    
4.25% convertible senior notes due 2026            
Earnings per share and New Accounting Principle            
Weighted average anti-dilutive awards   18,778 31,388