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Risk Management Fair values of price risk management assets and liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Current Assets, Commodity Contracts: |  |
Electricity | $ 34 | $ 4
Natural gas | 160 | 29
Total current derivative assets | 194 | 33
Noncurrent Assets, Commodity Contracts: [Abstract] |  |
Commodity Contract Asset, Noncurrent, Electricity | 9 | 4
Commodity Contract Asset, Noncurrent, Natural Gas | 69 | 8
Derivative Asset, Noncurrent | 78 | 12
Total derivative assets | 272 | 45
Current Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 37 | 13
Natural gas | 2 | 2
Total current derivative liabilities | 39 | 15
Noncurrent Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 89 | 133
Natural gas | 0 | 3
Total noncurrent derivative liabilities | 89 | 136
Total derivative liabilities | $ 128 | $ 151

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