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Long-Term Debt - CEI Term Loans and CEI Revolving Credit Facility (Narrative) (Details)
3 Months Ended
Feb. 06, 2024
USD ($)
Feb. 06, 2023
USD ($)
stepdown
Oct. 05, 2022
USD ($)
stepdown
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Jul. 20, 2020
USD ($)
Long-term debt            
Interest rate       4.30%    
Loss on extinguishment of debt       $ (48,000,000) $ (197,000,000)  
CRC Senior Secured Notes and CEI Senior Secured Notes Due 2025            
Long-term debt            
Loss on extinguishment of debt $ 48,000,000          
Senior Notes | CEI Term Loan B            
Long-term debt            
Debt instrument, face amount   $ 2,500,000,000        
Number of stepdowns | stepdown   1        
Leverage ratio stepdown   0.25%        
Percentage of original principal amount amortization   0.25%        
Percentage of principal amount issued   99.00%        
Senior Notes | CEI Term Loan B | SOFR | Component One | Minimum            
Long-term debt            
Spread on variable rate   0.50%        
Senior Notes | CEI Term Loan B | SOFR | Component Two            
Long-term debt            
Spread on variable rate   1.00%        
Senior Notes | CEI Term Loan B | Fed Funds Effective Rate Overnight Index Swap Rate | Component Two            
Long-term debt            
Spread on variable rate   0.50%        
Senior Notes | CEI Term Loan B | Base rate            
Long-term debt            
Spread on variable rate   2.25%        
Senior Notes | CEI Term Loan B | Applicable Margin            
Long-term debt            
Spread on variable rate   3.25%        
Senior Notes | CEI Term Loan B-1            
Long-term debt            
Debt instrument, face amount $ 2,900,000,000          
Percentage of original principal amount amortization 0.25%          
Percentage of principal amount issued 99.75%          
Senior Notes | CEI Term Loan B-1 | SOFR | Component One | Minimum            
Long-term debt            
Spread on variable rate 0.50%          
Senior Notes | CEI Term Loan B-1 | SOFR | Component Two            
Long-term debt            
Spread on variable rate 1.00%          
Senior Notes | CEI Term Loan B-1 | Fed Funds Effective Rate Overnight Index Swap Rate | Component Two            
Long-term debt            
Spread on variable rate 0.50%          
Senior Notes | CEI Term Loan B-1 | Base rate            
Long-term debt            
Spread on variable rate 1.75%          
Senior Notes | CEI Term Loan B-1 | Applicable Margin            
Long-term debt            
Spread on variable rate 2.75%          
Senior Notes | CRC Senior Secured Notes            
Long-term debt            
Interest rate 5.75%          
Senior Notes | CEI Senior Secured Notes due 2025            
Long-term debt            
Interest rate 6.25%          
CEI Revolving Credit Facility            
Long-term debt            
Available borrowing capacity       2,100,000,000    
CEI Revolving Credit Facility | Line of Credit            
Long-term debt            
Credit facility           $ 2,250,000,000
Amount outstanding       70,000,000    
CEI Revolving Credit Facility, Permitted Use Reserves            
Long-term debt            
Accordion feature           40,000,000
CEI Revolving Credit Facility, Regulatory Purpose            
Long-term debt            
Amount outstanding       $ 46,000,000    
Line of Credit            
Long-term debt            
Line of credit facility, commitment fee percentage     0.35%      
Line of Credit | SOFR            
Long-term debt            
Spread on variable rate     2.25%      
Line of Credit | SOFR | Component One            
Long-term debt            
Spread on variable rate     0.10%      
Line of Credit | SOFR | Component One | Minimum            
Long-term debt            
Spread on variable rate     0.00%      
Line of Credit | SOFR | Component Two            
Long-term debt            
Spread on variable rate     1.00%      
Line of Credit | Fed Funds Effective Rate Overnight Index Swap Rate | Component Two            
Long-term debt            
Spread on variable rate     0.50%      
Line of Credit | Base rate            
Long-term debt            
Spread on variable rate     1.25%      
Line of Credit | Letter of Credit            
Long-term debt            
Credit facility           $ 388,000,000
Line of Credit | Secured Debt            
Long-term debt            
Debt instrument, face amount     $ 750,000,000      
Interest rate     1.25%      
Number of stepdowns | stepdown     3      
Leverage ratio stepdown     0.25%      
Line of Credit | Revolving Credit Facility            
Long-term debt            
Number of stepdowns | stepdown     3      
Leverage ratio stepdown     0.05%