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Derivatives - Outstanding Natural Gas Supply Contracts Derivatives (Details) - MMBTU MMBTU in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2026 | Dec. 31, 2025
Natural gas supply contracts |  |
Derivative [Line Items] |  |
Total notional | 4,126 | 3,613

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