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Drilling and Completion Costs Associated to Joint Ventures (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified					6 Months Ended
	Oct. 31, 2011	Jun. 30, 2012 Minimum Subsequent Event Rigs	May 31, 2012 Minimum Subsequent Event Rigs	Jan. 31, 2012 Minimum Subsequent Event Rigs	Jun. 30, 2012 Utica	Jun. 30, 2012 Niobrara	Jun. 30, 2012 Barnett Shale	Sep. 30, 2009 Haynesville & Bossier
Business Acquisition [Line Items]
Percentage of reimburse from drilling carry					60.00%	67.00%
Operated rig count		12	2	6
Total amount of drilling carry obligations	$ 471
Billed obligations	46
Remaining carry obligations	$ 425
Percentage of reduction in drilling carry obligation							9.00%	12.00%

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity must commit resources to supply goods or services to one or more customers.

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