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Derivative Financial Instruments (Details 2)
MMBTU in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
MMBTU
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
MMBTU
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
MMBTU
Derivative Instruments and Hedging Activities Disclosure [Abstract]          
Notional Nonmonetary Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments | MMBTU 11.2   11.2   60.0
Percentage of Consumption Hedged by Derivatives     24.00%    
Fair values of derivatives on consolidated balance sheets          
Cash collateral on deposit with derivative counterparties $ 0   $ 0   $ 0
Aggregate fair value of the derivative instruments with credit risk related contingent features in a net liability position 0   0   31,000,000
Cash collateral on deposit with derivative counterparties 0   0   0
Winter Storm Uri          
Fair values of derivatives on consolidated balance sheets          
Gain (Loss) on Sale of Derivatives 0 $ 0 0 $ 112,000,000  
Not Designated as Hedging Instrument          
Fair values of derivatives on consolidated balance sheets          
Derivative Asset 22,000,000   22,000,000   16,000,000
Derivative Liability 3,000,000   3,000,000   47,000,000
Cash collateral on deposit with derivative counterparties 0   0   0
Cash collateral on deposit with derivative counterparties 0   0   0
Not Designated as Hedging Instrument | Energy Related Derivative          
Fair values of derivatives on consolidated balance sheets          
Derivative Asset 22,000,000   22,000,000   16,000,000
Derivative Liability 3,000,000   3,000,000   $ 47,000,000
Designated as Hedging Instrument          
Fair values of derivatives on consolidated balance sheets          
Derivative Asset $ 0   $ 0