Property, Plant, and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Total property, plant, and equipment | $ 60,293 | $ 41,546 |
| Less: accumulated depreciation | 19,524 | 19,072 |
| Property, plant, and equipment, net | 40,769 | 22,474 |
| Calpine | Electric Assets | ||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant, and equipment, net | 17,247 | |
| Calpine | CWIP Assets | ||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant, and equipment, net | 1,234 | |
| Electric | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property, plant, and equipment | 49,844 | 33,253 |
| Nuclear fuel | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property, plant, and equipment | 6,712 | 6,298 |
| CWIP | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property, plant, and equipment | $ 3,737 | $ 1,995 |