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Price Risk Management Schedule of Concentration of Risk, by Counterparty (Details) | Dec. 31, 2012 | Dec. 31, 2011
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Assets from price risk management activities: |  |
Counterparty A | 21.00% | 19.00%
Counterparty B | 13.00% | 2.00%
Counterparty C | 11.00% | 16.00%
Counterparty D | 10.00% | 9.00%
Counterparty E | 6.00% | 13.00%
Concentration of Risk, Derivative Instruments, Assets | 61.00% | 59.00%
Liabilities from price risk management activities: [Abstract] |  |
Counterparty F | 24.00% | 23.00%
Counterparty G | 14.00% | 10.00%
Counterparty H | 10.00% | 6.00%
Concentration of Risk, Derivative Instruments, Liabilities | 48.00% | 39.00%

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- Definition Counterparty G PRM Liabilities + References No definition available. + Details
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