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Fair values of price risk management assets and liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Current Assets, Commodity Contracts: |  |
Electricity | $ 18 | $ 13
Natural Gas | 14 | 9
Total current derivative assets | 32 | 22
Noncurrent Assets, Commodity Contracts: [Abstract] |  |
Commodity Contract Asset, Noncurrent, Electricity | 1 | 9
Commodity Contract Asset, Noncurrent, Natural Gas | 1 | 2
Derivative Asset, Noncurrent | 2 | 11
Total derivative assets | 34 | 33
Current Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 32 | 51
Natural Gas | 115 | 113
Total current derivative liabilities | 147 | 164
Noncurrent Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 24 | 22
Natural Gas | 48 | 53
Total noncurrent derivative liabilities | 72 | 75
Total derivative liabilities | $ 219 | $ 239

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- Definition Carrying amount as of the balance sheet date of the asset arising from commodity contracts related to electricity which are expected to be settled within a year or normal operating cycle, if longer. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of the asset arising from commodity contracts related to electricity which are expected to be settled after a year or beyond the normal operating cycle, if longer. + References No definition available. + Details
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