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Price Risk Management Schedule of Concentration of Risk, by Counterparty (Details)	Dec. 31, 2011	Dec. 31, 2010
Assets from price risk management activities:
Counterparty A	19.00%	1.00%
Counterparty B	16.00%	1.00%
Counterparty C	13.00%	5.00%
Counterparty D	7.00%	22.00%
Counterparty E	7.00%	23.00%
Counterparty F	0.00%	11.00%
Counterparty G	0.00%	10.00%
Concentration of Risk, Derivative Instruments, Assets	62.00%	73.00%
Liabilities from price risk management activities: [Abstract]
Counterparty E	23.00%	24.00%
Counterparty H	10.00%	4.00%
Counterparty I	7.00%	12.00%
Concentration of Risk, Derivative Instruments, Liabilities	40.00%	40.00%

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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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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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