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Fair Value Measurements (Details) - USD ($)
$ / shares in Units, $ in Millions
Jun. 30, 2022
Jun. 30, 2021
Apr. 22, 2021
7.750% Senior Secured Notes due 2026      
Debt Instrument [Line Items]      
Interest rate (as a percent) 7.75%   7.75%
Estimated fair value of loan $ 140 $ 347  
4.50% Convertible Senior Notes due 2026      
Debt Instrument [Line Items]      
Interest rate (as a percent) 4.50%    
Estimated fair value of loan $ 25 53  
Initial conversion price (in dollars per share) $ 15.29    
Stock price (in dollars per share) $ 0.58    
Second Lien Facility      
Debt Instrument [Line Items]      
Estimated fair value of loan $ 76 $ 189