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Long-Term Debt - CEI Revolving Credit Facility (Details)
Jul. 20, 2020
USD ($)
stepdown
Sep. 30, 2022
USD ($)
May 23, 2022
USD ($)
Nov. 10, 2021
USD ($)
Dec. 22, 2017
Long-term debt          
Interest rate   4.30%      
CEI Revolving Credit Facility | LIBOR          
Long-term debt          
Spread on variable rate 0.00%        
Line of Credit | CEI Revolving Credit Facility          
Long-term debt          
Debt instrument, term 5 years        
CEI Revolving Credit Facility          
Long-term debt          
Number of stepdowns | stepdown 3        
Leverage ratio, maximum 0.0025        
Line of credit facility, commitment fee percentage 0.50%        
Debt instrument, covenant, leverage ratio, minimum 0.00375        
Interest rate 0.125%        
Amount outstanding   $ 48,000,000      
CEI Revolving Credit Facility | LIBOR          
Long-term debt          
Spread on variable rate 1.00%        
CEI Revolving Credit Facility | Fed Funds Effective Rate Overnight Index Swap Rate          
Long-term debt          
Spread on variable rate 0.50%        
CEI Revolving Credit Facility | Prime Rate          
Long-term debt          
Spread on variable rate 3.25%        
CEI Revolving Credit Facility | Base rate          
Long-term debt          
Spread on variable rate 2.25%        
CEI Revolving Credit Facility | Line of Credit          
Long-term debt          
Credit facility $ 1,200,000,000        
CEI Revolving Credit Facility, Permitted Use Reserves          
Long-term debt          
Accordion feature       $ 190,000,000  
Reduction in required reserves     $ 150,000,000    
Letter of Credit          
Long-term debt          
Interest rate         0.125%
Amount outstanding   23,000,000      
Letter of Credit | Line of Credit          
Long-term debt          
Credit facility   59,000,000   $ 250,000,000  
Revolving Credit Facility          
Long-term debt          
Available borrowing capacity   $ 1,100,000,000