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Long-term debt and interest expense, net - Syndicated credit facility (Details)
shares in Millions, $ in Millions
3 Months Ended
Mar. 26, 2021
USD ($)
shares
Mar. 22, 2021
shares
Jun. 25, 2020
USD ($)
Dec. 02, 2019
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Long-term debt and interest expense, net              
Underwritten stock offering (in shares) | shares 10 10          
Loss on debt extinguishment           $ 41  
2023 Notes              
Long-term debt and interest expense, net              
Aggregate principal amount       $ 1,000      
Interest rate (as a percent)       9.75%      
Notes issue price percentage       98.00%      
Aggregate principal amount repurchased     $ 150   $ 150    
Percentage of principal amount of repurchased debt     112.45%        
Principal amount of redeemed $ 350            
Premium paid for debt redemption $ 34            
Loss on debt extinguishment           $ 41  
Percentage of premium paid on repurchase of notes     12.45%        
2027 Notes              
Long-term debt and interest expense, net              
Aggregate principal amount     $ 150        
Interest rate (as a percent)     7.54%        
Issue Price (as a percent)     98.25%        
Syndicated Credit Facility | At the end of each fiscal quarter for the next six months              
Long-term debt and interest expense, net              
Maximum debt to EBITDA         7.25    
Syndicated Credit Facility | At the end of each fiscal quarter for the next twelve months              
Long-term debt and interest expense, net              
Maximum debt to EBITDA         6.25    
Syndicated Credit Facility | For each fiscal quarter thereafter              
Long-term debt and interest expense, net              
Maximum debt to EBITDA         5.50    
Syndicated Credit Facility | Upon a disposition of a business line for greater than $500 million              
Long-term debt and interest expense, net              
Maximum debt to EBITDA         0.25    
Revolving Credit Facility              
Long-term debt and interest expense, net              
Letter of credit outstanding         $ 28   $ 28
Revolving Credit Facility | Upon a disposition of a business line for greater than $500 million              
Long-term debt and interest expense, net              
Minimum amount of disposition of business line to trigger a reduction in each maximum level of consolidated debt to EBITDA         500    
Revolving Credit Facility | Maturing in December 2023              
Long-term debt and interest expense, net              
Maximum borrowing capacity         500    
Letter of credit              
Long-term debt and interest expense, net              
Maximum borrowing capacity         200    
Term Loan B | Maturing in October 2024              
Long-term debt and interest expense, net              
Aggregate principal amount         $ 2,000