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Price Risk Management Counterparties Representing 10% or More of Assets and Liabilities from price risk management activities (Details)	Sep. 30, 2016	Dec. 31, 2015
Assets from price risk management activities:
Counterparty A	34.00%	5.00%
Counterparty B	12.00%	8.00%
Counterparty C	10.00%	8.00%
Counterparty D	7.00%	10.00%
Counterparty E	2.00%	59.00%
Total	65.00%	90.00%
Liabilities from price risk management activities:
Counterparty F	61.00%	36.00%
Counterparty C	8.00%	10.00%
Counterparty B	7.00%	10.00%
Total	76.00%	56.00%

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Assets from price risk management activities: [Abstract]

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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 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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No definition available.

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

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Counterparty D for PRM Liab

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

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Counterparty E For PRM Liab

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Liabilities from price risk management activities: [Abstract]

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