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Risk Management Fair values of price risk management assets and liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Current Assets, Commodity Contracts: |  |
Electricity | $ 20 | $ 13
Natural gas | 9 | 9
Total current derivative assets | 29 | 22
Noncurrent Assets, Commodity Contracts: [Abstract] |  |
Commodity Contract Asset, Noncurrent, Electricity | 6 | 9
Commodity Contract Asset, Noncurrent, Natural Gas | 2 | 2
Derivative Asset, Noncurrent | 8 | 11
Total derivative assets | 37 | 33
Current Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 44 | 51
Natural gas | 93 | 113
Total current derivative liabilities | 137 | 164
Noncurrent Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 17 | 22
Natural gas | 39 | 53
Total noncurrent derivative liabilities | 56 | 75
Total derivative liabilities | $ 193 | $ 239

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