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Risk Management Fair values of price risk management assets and liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Current Assets, Commodity Contracts: |  |
Electricity | $ 9 | $ 9
Natural gas | 48 | 16
Total current derivative assets | 57 | 25
Noncurrent Assets, Commodity Contracts: [Abstract] |  |
Commodity Contract Asset, Noncurrent, Electricity | 2 | 7
Commodity Contract Asset, Noncurrent, Natural Gas | 22 | 6
Derivative Asset, Noncurrent | 24 | 13
Total derivative assets | 81 | 38
Current Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 11 | 14
Natural gas | 5 | 9
Total current derivative liabilities | 16 | 23
Noncurrent Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 138 | 105
Natural gas | 0 | 3
Total noncurrent derivative liabilities | 138 | 108
Total derivative liabilities | $ 154 | $ 131

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