Fair Value Measurements (Narrative) (Details) $ in Millions |
3 Months Ended | 12 Months Ended |
|---|---|---|
|
Mar. 31, 2026
USD ($)
MMcf
|
Dec. 31, 2025
USD ($)
|
|
| Natural Gas [Member] | Ten-year Physical Commodity Sales Contract [Member] | ||
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||
| Natural gas volumes | MMcf | 100 | |
| Forward Price [Member] | ||
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||
| Increase (decrease) in net risk management assets and liabilities | $ | $ 27 | $ 24 |