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Price Risk Management Schedule of Concentration of Risk, by Counterparty (Details)	Dec. 31, 2012	Dec. 31, 2011
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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Represents aggregate of individually significant counterparties of total assets arising from derivative instruments from price risk management activities.

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Represents aggregate of individually significant counterparties of total liabilities arising from derivative instruments from price risk management activities.

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Individually significant counterparty of total assets arising from derivative instruments from price risk management activities.

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Individually significant counterparty of total assets arising from derivative instruments from price risk management activities.

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Individually significant counterparty of total assets arising from derivative instruments from price risk management activities.

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Individually significant counterparty of total assets arising from dreivative instruments from price risk management activities.

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Individually significant counterparty of total assets arising from derivative instruments from price risk management activities.

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Individually significant counterparty of total liabilities arising from derivative instruments from price risk management activities.

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Counterparty G PRM Liabilities

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Individually significant counterparty of total liabilities arising from derivative instruments from price risk management activities.

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