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Supplemental Balance Sheet Data -Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts payable $ 110 $ 85
Accrued natural gas costs 168 106
Payroll and employee-related costs 88 68
Accrued interest 30 32
Other 169 133
Total accounts payable and accrued expenses $ 565 $ 424