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Derivative Financial Instruments (Details 2)
MMBTU in Millions
 9 Months Ended
Sep. 30, 2023
USD ($)
MMBTU
Dec. 31, 2022
USD ($)
MMBTU
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Notional Nonmonetary Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments | MMBTU 65.3 66.3
Percentage of Consumption Hedged by Derivatives 27.00%  
Fair values of derivatives on consolidated balance sheets    
Cash collateral on deposit with derivative counterparties $ 0 $ 0
Aggregate fair value of the derivative instruments with credit risk related contingent features in a net liability position 8,000,000 73,000,000
Cash collateral on deposit with derivative counterparties 0 0
Not Designated as Hedging Instrument    
Fair values of derivatives on consolidated balance sheets    
Derivative Asset 8,000,000 12,000,000
Derivative Liability 16,000,000 85,000,000
Cash collateral on deposit with derivative counterparties 0 0
Cash collateral on deposit with derivative counterparties 0 0
Not Designated as Hedging Instrument | Energy Related Derivative    
Fair values of derivatives on consolidated balance sheets    
Derivative Asset 8,000,000 12,000,000
Derivative Liability 16,000,000 $ 85,000,000
Designated as Hedging Instrument    
Fair values of derivatives on consolidated balance sheets    
Derivative Asset $ 0