Derivatives and Risk Management Activities - Fair Value (Details) - Recurring Fair Value Measures - USD ($) $ in Millions |
Mar. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Recurring Fair Value Measurements | ||
| Total net derivative asset/(liability) | $ (18) | $ (49) |
| Level 1 | ||
| Recurring Fair Value Measurements | ||
| Total net derivative asset/(liability) | 21 | 14 |
| Level 2 | ||
| Recurring Fair Value Measurements | ||
| Total net derivative asset/(liability) | (39) | (63) |
| Commodity Derivatives | ||
| Recurring Fair Value Measurements | ||
| Total net derivative asset/(liability) | (43) | (76) |
| Commodity Derivatives | Level 1 | ||
| Recurring Fair Value Measurements | ||
| Total net derivative asset/(liability) | 21 | 14 |
| Commodity Derivatives | Level 2 | ||
| Recurring Fair Value Measurements | ||
| Total net derivative asset/(liability) | (64) | (90) |
| Interest Rate Derivatives | ||
| Recurring Fair Value Measurements | ||
| Total net derivative asset/(liability) | 25 | 27 |
| Interest Rate Derivatives | Level 2 | ||
| Recurring Fair Value Measurements | ||
| Total net derivative asset/(liability) | $ 25 | $ 27 |