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Goodwill and Other Intangible Assets (Details 2) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Identifiable intangibles      
Gross Carrying Amount $ 576 $ 579  
Accumulated Amortization (103) (72)  
Net 473 507  
Customer relationships      
Identifiable intangibles      
Gross Carrying Amount 505 505  
Accumulated Amortization (91) (66)  
Net $ 414 439  
Finite-lived intangible asset, useful life 20 years    
Amortization expense $ 32 32 $ 5
Personal property tax agreement      
Identifiable intangibles      
Gross Carrying Amount 71 71  
Accumulated Amortization (12) (6)  
Net 59 65  
Carbon Credit      
Identifiable intangibles      
Gross Carrying Amount 0 3  
Accumulated Amortization 0 0  
Net $ 0 $ 3  
Property Tax Agreement      
Identifiable intangibles      
Finite-lived intangible asset, useful life 12 years