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Price Risk Management Fair values of price risk management assets and liabilities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Current Assets, Commodity Contracts: |  |
Commodity Contract Asset, Current, Electricity | $ 1 | $ 2
Commodity Contract Asset, Current, Natural Gas | 3 | 17
Current Derivative Assets | 4 | 19
Noncurrent Assets, Commodity Contracts: [Abstract] |  |
Commodity Contract Asset, Noncurrent, Natural Gas | 2 | 0
Total derivative assets not designated as hedging instruments | 6 | 19
Total derivative assets | 6 | 19
Current liabilities: |  |
Commodity Contract Liability, Current, Electricity | 44 | 66
Commodity Contract Liability, Current, Natural Gas | 83 | 150
Total current derivative liabilities | 127 | 216
Liabilities, Noncurrent [Abstract] |  |
Commodity Contract Liability, Noncurrent, Electricity | 38 | 71
Commodity Contract Liability, Noncurrent, Natural Gas | 35 | 101
Total noncurrent derivative liabilities | 73 | 172
Total derivative liabilities not designated as hedging instruments | 200 | 388
Total derivative liabilities | $ 200 | $ 388

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- Definition Carrying amount as of the balance sheet date of the asset arising from commodity contracts related to electricity which are expected to be settled within a year or normal operating cycle, if longer. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of the asset arising from commodity contracts related to natural gas which are expected to be settled within a year or normal operating cycle, if longer. + References No definition available. + Details
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