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Fair values of price risk management assets and liabilities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Current Assets, Commodity Contracts: |  |
Electricity | $ 9 | $ 1
Natural Gas | 4 | 3
Total current derivative assets | 13 | 4
Commodity Contract Asset, Noncurrent, Electricity | 1 | 0
Noncurrent Assets, Commodity Contracts: [Abstract] |  |
Natural Gas | 0 | 2
Total derivative assets not designated as hedging instruments | 14 | 6
Total derivative assets | 14 | 6
Current Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 20 | 44
Natural Gas | 29 | 83
Total current derivative liabilities | 49 | 127
Noncurrent Liabilities, Commodity Contracts: [Abstract] |  |
Electricity | 107 | 38
Natural Gas | 34 | 35
Total noncurrent derivative liabilities | 141 | 73
Total derivative liabilities not designated as hedging instruments | 190 | 200
Total derivative liabilities | $ 190 | $ 200

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