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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, 2014 | Dec. 31, 2013
--- | --- | ---
Current Assets, Commodity Contracts: |  |
Electricity | $ 8 | $ 9
Natural gas | 10 | 4
Total current derivative assets | 18 | 13
Noncurrent Assets, Commodity Contracts: [Abstract] |  |
Electricity | 0 | 1
Natural gas | 5 | 0
Total noncurrent derivative assets | 5 | 1
Total derivative assets not designated as hedging instruments | 23 | 14
Total derivative assets | 23 | 14
Current Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 18 | 20
Natural gas | 14 | 29
Total current derivative liabilities | 32 | 49
Noncurrent Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 66 | 107
Natural gas | 17 | 34
Total noncurrent derivative liabilities | 83 | 141
Total derivative liabilities not designated as hedging instruments | 115 | 190
Total derivative liabilities | $ 115 | $ 190

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