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Selected Balance Sheet Data Selected Balance Sheet Data, Inventories (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Public Utilities, Inventory [Line Items] |  |
Total inventories | $ 723 | $ 666
Materials and supplies |  |
Public Utilities, Inventory [Line Items] |  |
Inventories | 461 | 406
Fuel |  |
Public Utilities, Inventory [Line Items] |  |
Inventories | 145 | 164
Natural gas |  |
Public Utilities, Inventory [Line Items] |  |
Inventories | $ 117 | $ 96

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