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Price Risk Management Counterparties Representing 10% or More (Details) | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Assets from price risk management activities: |  |
Counterparty A | 16.00% | 16.00%
Counterparty B | 12.00% | 19.00%
Counterparty C | 11.00% | 7.00%
Counterparty D | 8.00% | 13.00%
Concentration of Risk, Derivative Instruments, Assets | 47.00% | 55.00%
Liabilities from price risk management activities: |  |
Counterparty C | 22.00% | 23.00%
Counterparty E | 13.00% | 10.00%
Concentration of Risk, Derivative Instruments, Liabilities | 35.00% | 33.00%

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- Definition Represents aggregate of individually significant counterparties of total assets arising from derivative instruments from price risk management activities. + References No definition available. + Details
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- Definition Individually significant counterparty of total assets arising from derivative instruments from price risk management activities. + References No definition available. + Details
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- Definition Individually significant counterparty of total assets arising from derivative instruments from price risk management activities. + References No definition available. + Details
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- Definition Individually significant counterparty of total assets arising from derivative instruments from price risk management activities. + References No definition available. + Details
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- Definition Individually significant counterparty of total assets arising from dreivative instruments from price risk management activities. + References No definition available. + Details
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