Financial Risk Management Activities - Schedule of Derivative Instruments Not Designated as Hedging Instruments and Impact on Results of Operations (Details) - Energy-Related Contracts [Member] - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ (243) | $ (147) |
| Operating Revenues [Member] | ||
| Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | (241) | (148) |
| Energy Costs [Member] | ||
| Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ (2) | $ 1 |