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Summary of Significant Accounting Policies and Other Matters - Reconciliation of Cash, Temporary Investments and Restricted Cash (Details)
$ in Millions
Sep. 30, 2024
USD ($)
MWh
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Mar. 01, 2023
MWh
Cash and Cash Equivalents [Line Items]        
Cash and temporary cash investments $ 93 $ 1,189 $ 539  
Restricted cash 9   6  
Total cash, temporary cash investments and restricted cash $ 102   $ 545  
Electric Energy (MWh)        
Cash and Cash Equivalents [Line Items]        
Notional amount | MWh 36,052,760      
Broken Bow II | Electric Energy (MWh) | Clean Energy Businesses        
Cash and Cash Equivalents [Line Items]        
Notional amount | MWh 75     75