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Long-Term Debt - CEI Revolving Credit Facility (Details)
9 Months Ended
Jul. 20, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 25, 2020
USD ($)
Mar. 16, 2020
USD ($)
Dec. 22, 2017
Apr. 17, 2017
USD ($)
Long-term debt            
Interest rate (as a percent)   4.30%        
CEI Revolving Credit Facility | LIBOR            
Long-term debt            
Spread on variable rate (as a percent) 0.00% 2.75%        
Revolving Credit Facility            
Long-term debt            
Credit facility       $ 465,000,000    
Revolving Credit Facility | CEI Revolving Credit Facility | Fed Funds Effective Rate Overnight Index Swap Rate            
Long-term debt            
Spread on variable rate (as a percent)   2.25%        
Revolving Credit Facility | Line of Credit            
Long-term debt            
Debt instrument, term 5 years          
CEI Revolving Credit Facility            
Long-term debt            
Debt instrument, covenant, leverage ratio, maximum 0.0025          
Line of credit facility, commitment fee percentage 0.50%          
Debt instrument, covenant, leverage ratio, minimum 0.00375          
Interest rate (as a percent) 0.125%          
CEI Revolving Credit Facility | LIBOR            
Long-term debt            
Spread on variable rate (as a percent) 1.00%          
CEI Revolving Credit Facility | Fed Funds Effective Rate Overnight Index Swap Rate            
Long-term debt            
Spread on variable rate (as a percent) 0.50%          
CEI Revolving Credit Facility | Prime Rate            
Long-term debt            
Spread on variable rate (as a percent) 3.25%          
CEI Revolving Credit Facility | Base rate            
Long-term debt            
Spread on variable rate (as a percent) 2.25%          
CEI Revolving Credit Facility | Line of Credit            
Long-term debt            
Credit facility $ 1,200,000,000   $ 900,000,000      
Letter of Credit            
Long-term debt            
Interest rate (as a percent)         0.125%  
Amount outstanding   $ 19,000,000        
Letter of Credit | Line of Credit            
Long-term debt            
Credit facility $ 250,000,000 64,000,000        
Revolving Credit Facility            
Long-term debt            
Credit facility   900,000,000       $ 500,000,000
Available borrowing capacity   $ 266,000,000