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Supplemental Balance Sheet Data - Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts payable $ 114 $ 63
Construction Payable, Current 48 39
Accrued natural gas costs 85 200
Payroll and employee-related costs 81 82
Accrued interest 30 30
Other current liabilities 162 161
Total accounts payable and accrued expenses 520 575
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Construction in progress expenditures incurred but not yet paid 68 53
Accounts Payable and Accrued Liabilities    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Construction in progress expenditures incurred but not yet paid $ 20 $ 14