Government Assistance (Details) - Nuclear PTCs - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Jun. 30, 2025 |
Mar. 31, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2024 |
|
| Government Assistance [Line Items] | ||||||
| Estimate | $ 45 | $ 408 | $ 45 | $ 712 | ||
| Estimated nuclear PTCs credits used | $ 215 | $ 150 | ||||
| Estimated refunds recognized | $ 1,060 | $ 1,060 | $ 1,030 | |||
| Government Assistance, Liability, Statement of Financial Position [Extensible Enumeration] | Other noncurrent liabilities | Other noncurrent liabilities | Other noncurrent liabilities | |||
| Government assistance, operating income, increase (decrease) | $ (75) | $ (51) | $ (190) | $ (120) | ||
| Deferred Costs and Other Assets | ||||||
| Government Assistance [Line Items] | ||||||
| Estimated nuclear PTC receivable | $ 185 | |||||
| Other Current Assets | ||||||
| Government Assistance [Line Items] | ||||||
| Estimated nuclear PTC receivable | $ 95 | |||||