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Fair values of price risk management assets and liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Current Assets, Commodity Contracts: |  |
Electricity | $ 112 | $ 16
Natural Gas | 201 | 86
Total current derivative assets | 313 | 102
Noncurrent Assets, Commodity Contracts: [Abstract] |  |
Commodity Contract Asset, Noncurrent, Electricity | 44 | 1
Commodity Contract Asset, Noncurrent, Natural Gas | 30 | 34
Derivative Asset, Noncurrent | 74 | 35
Total derivative assets | 387 | 137
Current Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 93 | 36
Natural Gas | 25 | 11
Total current derivative liabilities | 118 | 47
Noncurrent Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 53 | 87
Natural Gas | 22 | 3
Total noncurrent derivative liabilities | 75 | 90
Total derivative liabilities | $ 193 | $ 137

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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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