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Supplemental Balance Sheet Data - Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts payable $ 148 $ 125
Construction Payable, Current 51 59
Accrued natural gas costs 127 106
Payroll and employee-related costs 113 69
Accrued interest 32 30
Other current liabilities 210 214
Total accounts payable and accrued expenses 681 603
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Construction in progress expenditures incurred but not yet paid 118 101
Other Noncurrent Liabilities    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Construction in progress expenditures incurred but not yet paid 2  
Accounts Payable and Accrued Liabilities    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Construction in progress expenditures incurred but not yet paid $ 65 $ 42