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Incentive Plans (Number Of Awards Available Under Company's Long Term Incentive Plan) (Details) (Pioneer Southwest LTIP [Member])	12 Months Ended
	Dec. 31, 2011
Pioneer Southwest LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approved and authorized awards	3,000,000
Awards issued after May 6, 2008	(106,252)
Awards available for future grant	2,893,748

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

The number of shares newly issued during the reporting period under the plan.

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