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Summary of Significant Accounting Policies and Other Matters - Reconciliation of Cash, Temporary Investments and Restricted Cash (Details)
$ in Millions
Mar. 31, 2025
USD ($)
MWh
Dec. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
MWh
Mar. 01, 2023
MWh
Cash and Cash Equivalents [Line Items]        
Cash and temporary cash investments $ 360 $ 1,324 $ 169  
Restricted cash     6  
Total cash, temporary cash investments and restricted cash     $ 175  
Electric Energy (MWh)        
Cash and Cash Equivalents [Line Items]        
Notional amount | MWh 29,654,925      
Broken Bow II | Electric Energy (MWh) | Clean Energy Businesses        
Cash and Cash Equivalents [Line Items]        
Notional amount | MWh     75 75