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Derivative Instruments and Hedging Activity - Narrative (Details)
MWh in Millions, $ in Millions
Oct. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
MWh
Dec. 31, 2022
USD ($)
MWh
Derivative [Line Items]      
Derivative Instruments with Contingent Features Liabilities, at Fair Value   $ 15 $ 37
Subsequent Event | Interest Rate Swap [Member]      
Derivative [Line Items]      
Notional amount $ 1,850    
Interest Rate Swap [Member]      
Derivative [Line Items]      
Notional amount   $ 2,200 $ 7,800
Commodity Contract      
Derivative [Line Items]      
Derivative, Nonmonetary Notional Amount | MWh   6.0 5.7