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Earnings Per Share - Additional Information (Details) - shares
shares in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Common stock equivalents (in shares)   3 3 3
Stock Options and Restricted Stock Awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Common stock equivalents (in shares)   2    
Preferred Stock | Convertible Debt Securities        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Common stock equivalents (in shares) 40      
4.00% senior exchangeable notes due 2025 | Senior Secured Notes | Convertible Debt Securities        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Common stock equivalents (in shares) 44