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Risk Management Fair values of price risk management assets and liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Current Assets, Commodity Contracts: |  |
Electricity | $ 28 | $ 9
Natural gas | 18 | 16
Total current derivative assets | 46 | 25
Noncurrent Assets, Commodity Contracts: [Abstract] |  |
Commodity Contract Asset, Noncurrent, Electricity | 0 | 7
Commodity Contract Asset, Noncurrent, Natural Gas | 10 | 6
Derivative Asset, Noncurrent | 10 | 13
Total derivative assets | 56 | 38
Current Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 30 | 14
Natural gas | 10 | 9
Total current derivative liabilities | 40 | 23
Noncurrent Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 143 | 105
Natural gas | 2 | 3
Total noncurrent derivative liabilities | 145 | 108
Total derivative liabilities | $ 185 | $ 131

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