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Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Finance lease [extensible enumeration] Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization  
Carrying value of finance lease assets $ 142 $ 143  
Payments, year one 11    
Payments, year two 11    
Payments, year three 9    
Payments, year four 8    
Payments, year five 6    
Payments, thereafter 83    
Operating leases, rent expense 13 12 $ 11
Operating lease payments 12 11 11
Right-of-use asset obtained in exchange for operating lease liability $ 8 $ 11 $ 11
Operating lease, weighted-average remaining lease term 18 years 18 years 17 years
Operating lease, weighted-average discount rate 5.00% 5.00% 4.00%
Imputed interest $ 46    
Operating and Maintenance Agreement      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Payments, year one 4    
Payments, year two 4    
Payments, year three 4    
Payments, year four 4    
Payments, year five 4    
Payments, thereafter $ 33    
Real Property      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease, term of contract 39 years    
Vehicles      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease, term of contract 4 years    
Equipment      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease, term of contract 5 years    
Minimum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease, renewal term 1 year    
Minimum | Utility Plant      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Lessee, finance lease, term of contract 30 years    
Maximum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease, renewal term 60 years    
Maximum | Utility Plant      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Lessee, finance lease, term of contract 40 years