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Price Risk Management Fair values of price risk management assets and liabilities (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Current Assets, Commodity Contracts: |  |
Electricity | $ 2 | $ 1
Natural gas | 1 | 3
Total current derivative assets | 3 | 4
Noncurrent Assets, Commodity Contracts: [Abstract] |  |
Commodity Contracts-Natural gas | 0 | 2
Total derivative assets not designated as hedging instruments | 3 | 6
Total derivative assets | 3 | 6
Current Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 43 | 44
Natural gas | 60 | 83
Total current derivative liabilities | 103 | 127
Noncurrent Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 44 | 38
Natural gas | 34 | 35
Total noncurrent derivative liabilities | 78 | 73
Total derivative liabilities not designated as hedging instruments | 181 | 200
Total derivative liabilities | $ 181 | $ 200

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