Selected Balance Sheet Data - Inventories (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Dec. 31, 2025 |
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| Inventory [Line Items] | ||
| Total Inventories | $ 39 | $ 33 |
| Materials and supplies | ||
| Inventory [Line Items] | ||
| Inventories | 21 | 16 |
| Fuel | ||
| Inventory [Line Items] | ||
| Inventories | 10 | 10 |
| Natural gas | ||
| Inventory [Line Items] | ||
| Inventories | $ 8 | $ 7 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The period end amount for a type of inventory held by the utility in a schedule of inventories. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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