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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, 2024 USD ($) MWh | Dec. 31, 2023 USD ($) | Mar. 31, 2023 USD ($)
--- | --- | --- | ---
Cash and Cash Equivalents [Line Items] |  |  |
Cash and temporary cash investments | $ 169 | $ 1,189 | $ 771
Restricted cash | 6 |  | 2
Total cash, temporary cash investments and restricted cash | $ 175 |  | $ 773
Electric Energy (MWh) |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Notional amount | MWh | 31,374,625 |  |
Broken Bow II | Electric Energy (MWh) | Clean Energy Businesses |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Notional amount | MWh | 75 |  |

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