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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

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