Selected Balance Sheet Data Balance Sheet Related Disclosures, Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
||
|---|---|---|---|---|
| Balance Sheet Related Disclosures [Abstract] | ||||
| Electric plant | $ 13,100 | $ 12,210 | ||
| Plant to be retired | [1] | 144 | 162 | |
| Construction work in progress | 1,282 | 1,117 | ||
| Total property, plant and equipment | 14,526 | 13,489 | ||
| Less accumulated depreciation | (3,207) | (3,063) | ||
| Property, plant and equipment, net | $ 11,319 | $ 10,426 | ||
| ||||