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Summary of Significant Accounting Policies and Other Matters - Reconciliation of Cash, Temporary Investments and Restricted Cash (Details)
$ in Millions
Jun. 30, 2023
USD ($)
MWh
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Cash and Cash Equivalents [Line Items]      
Cash and temporary cash investments $ 1,955 $ 1,282 $ 1,127
Restricted cash 1   113
Total cash, temporary cash investments and restricted cash $ 1,956   1,240
Electric Energy (MWh)      
Cash and Cash Equivalents [Line Items]      
Notional amount | MWh 27,335,565    
Broken Bow II | Electric Energy (MWh) | Clean Energy Businesses      
Cash and Cash Equivalents [Line Items]      
Notional amount | MWh 75    
Subsidiaries      
Cash and Cash Equivalents [Line Items]      
Cash and temporary cash investments $ 1,348 $ 1,056 1,072
Restricted cash 0   0
Total cash, temporary cash investments and restricted cash $ 1,348   1,072
Clean Energy Businesses | Cash Collateral Held for Project Finance Agreements      
Cash and Cash Equivalents [Line Items]      
Restricted cash     $ 113