Risk Management Net realized and unrealized gains and losses on derivative transactions (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2024 |
Jun. 30, 2023 |
Jun. 30, 2024 |
Jun. 30, 2023 |
|
| Commodity contracts: | ||||
| Electricity | $ (11) | $ 88 | $ (30) | $ 53 |
| Natural Gas | $ 6 | $ 65 | $ 20 | $ 197 |