Inventories (Details) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Public Utilities, Inventory [Line Items] | ||
| Inventories | $ 335 | $ 339 |
| Materials and supplies | ||
| Public Utilities, Inventory [Line Items] | ||
| Inventories | 245 | 234 |
| Fuel | ||
| Public Utilities, Inventory [Line Items] | ||
| Inventories | 80 | 81 |
| Natural Gas | ||
| Public Utilities, Inventory [Line Items] | ||
| Inventories | $ 10 | $ 24 |