Selected Balance Sheet Data - Property, Plant and Equipment (Details) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Public Utility, Property, Plant and Equipment [Line Items] | ||
| Common and other property | $ 315 | $ 309 |
| Construction work in progress | 499 | 406 |
| Total property, plant and equipment | 5,659 | 5,365 |
| Less accumulated depreciation | (1,747) | (1,695) |
| Property, plant and equipment, net | 3,912 | 3,670 |
| Electricity Generation Plant, Non-Nuclear | ||
| Public Utility, Property, Plant and Equipment [Line Items] | ||
| Plant | 4,272 | 4,103 |
| Natural Gas Processing Plant | ||
| Public Utility, Property, Plant and Equipment [Line Items] | ||
| Plant | $ 573 | $ 547 |