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Derivative Financial Instruments (Details 3) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
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 34,000,000 73,000,000
Cash collateral on deposit with derivative counterparties 0 0
Derivatives not designated as cash flow hedges    
Fair values of derivatives on consolidated balance sheets    
Derivative assets 1,000,000 12,000,000
Derivative Liability (35,000,000) (85,000,000)
Cash collateral on deposit with derivative counterparties 0 0
Cash collateral on deposit with derivative counterparties 0 0
Derivatives not designated as cash flow hedges | Natural gas derivatives    
Fair values of derivatives on consolidated balance sheets    
Derivative assets 1,000,000 12,000,000
Derivative Liability $ 35,000,000 $ 85,000,000