Selected Balance Sheet Data - Property, Plant and Equipment (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Public Utility, Property, Plant and Equipment [Line Items] | ||
| Common and other property | $ 331 | $ 329 |
| Construction work in progress | 725 | 673 |
| Total property, plant and equipment | 6,604 | 5,993 |
| Less accumulated depreciation | (1,869) | (1,780) |
| Property, plant and equipment, net | 4,735 | 4,213 |
| Electricity Generation Plant, Non-Nuclear | ||
| Public Utility, Property, Plant and Equipment [Line Items] | ||
| Plant | 4,910 | 4,383 |
| Natural Gas Processing Plant | ||
| Public Utility, Property, Plant and Equipment [Line Items] | ||
| Plant | $ 638 | $ 608 |