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v3.23.3

Summary of Significant Accounting Policies and Other Matters - Reconciliation of Cash, Temporary Investments and Restricted Cash (Details) $ in Millions | Sep. 30, 2023 USD ($) MWh | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($)
--- | --- | --- | ---
Cash and Cash Equivalents [Line Items] |  |  |
Cash and temporary cash investments | $ 539 | $ 1,282 | $ 78
Restricted cash | 6 |  | 163
Total cash, temporary cash investments and restricted cash | $ 545 |  | 241
Electric Energy (MWh) |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Notional amount | MWh | 30,376,045 |  |
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 | $ 20 |  | 25
Restricted cash | 0 |  | 0
Total cash, temporary cash investments and restricted cash | 20 |  | 25
Clean Energy Businesses | Cash Collateral Held for Project Finance Agreements |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Restricted cash | $ 5 |  | $ 163

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