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DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
Bcf
Dec. 31, 2020
USD ($)
Bcf
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative, Nonmonetary Notional Amount | Bcf 13.2 14.7
Premiums recorded in other current assets on natural gas contracts held $ 9,500,000 $ 6,700,000
Fair Value Assets, Transfers between Levels 0 0
Corporate bonds in other assets 6,900,000 1,600,000
Treasury notes in other assets 3,500,000 3,200,000
Long-term Debt 3,700,000,000 1,600,000,000
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value of natural gas call options held 2,300,000 800,000
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Long-term Debt, Fair Value $ 3,900,000,000 $ 2,000,000,000