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Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Loss available to common stockholders $ (124) $ (194)
Weighted-average shares outstanding, basic (in shares) 328.3 327.4
Weighted-average shares outstanding, diluted(in shares) 328.3 327.4
Loss per share, basic (in dollars per share) $ (0.38) $ (0.59)
Loss per share, diluted (in dollars per share) $ (0.38) $ (0.59)
CARES Act Loan Warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Warrants to purchase securities (in shares) 10.0  
CARES Act Loan Warrants | Minimum    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Warrant exercise price (in dollars per share) $ 31.50  
CARES Act Loan Warrants | Maximum    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Warrant exercise price (in dollars per share) $ 53.92  
Stock warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities (in shares) 3.5 1.5
Employee stock awards    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities (in shares) 0.5 0.7