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Leases - Land Lease with Wholly-Owned Subsidiary (Details)
$ in Millions
Dec. 31, 2024
USD ($)
renewalOption
Dec. 31, 2023
USD ($)
May 31, 2023
Lessee, Lease, Description [Line Items]      
Right-of-use assets, net $ 547 $ 597  
Long-term lease liabilities 579    
Renewal period     5 years
Daggett 2 | CEG      
Lessee, Lease, Description [Line Items]      
Right-of-use assets, net 22 22  
Long-term lease liabilities 23 23  
Daggett 3 | CEG      
Lessee, Lease, Description [Line Items]      
Right-of-use assets, net 30 31  
Long-term lease liabilities 34 33  
Mililani I | CEG      
Lessee, Lease, Description [Line Items]      
Right-of-use assets, net 18 19  
Long-term lease liabilities $ 21 20  
Oahu Solar LLC      
Lessee, Lease, Description [Line Items]      
Number of renewal options | renewalOption 2    
Renewal period 5 years    
Oahu Solar LLC | CEG      
Lessee, Lease, Description [Line Items]      
Right-of-use assets, net $ 17 17  
Long-term lease liabilities 19 20  
Rosamond Central | CEG      
Lessee, Lease, Description [Line Items]      
Right-of-use assets, net 11 11  
Long-term lease liabilities $ 12 $ 12