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Price Risk Management Fair values of price risk management assets and liabilities (Details) (USD $) In Millions | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Current Assets, Commodity Contracts: |  |
Electricity | $ 6 | $ 4
Natural gas | 3 | 9
Total current derivative assets | 9 | 13
Noncurrent Assets, Commodity Contracts: [Abstract] |  |
Electricity | 1 | 1
Natural gas | 0 | 2
Total noncurrent derivative assets | 1 | 3
Total derivative assets not designated as hedging instruments | 10 | 16
Total derivative assets | 10 | 16
Current Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 56 | 77
Natural gas | 107 | 111
Total current derivative liabilities | 163 | 188
Noncurrent Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 37 | 42
Natural gas | 106 | 146
Total noncurrent derivative liabilities | 143 | 188
Total derivative liabilities not designated as hedging instruments | 306 | 376
Total derivative liabilities | $ 306 | $ 376

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