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v3.23.2

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

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