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Supplemental Balance Sheet Data - Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts payable $ 125 $ 114
Construction Payable, Current 59 48
Accrued natural gas costs 106 85
Payroll and employee-related costs 69 81
Accrued interest 30 30
Other current liabilities 214 162
Total accounts payable and accrued expenses 603 520
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Construction in progress expenditures incurred but not yet paid 101 68
Accounts Payable, Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Construction in progress expenditures incurred but not yet paid $ 42 $ 20