Acquisitions and Divestitures (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2011
Notes To Financial Statements [Abstract]
Additional Ownership Interest Acquired by Company in Planned Natural Gas Pipeline	24.50%
Purchase Price to Acquire Additional Interest in Planned Natural Gas Pipeline	$ 25.2
Portion of Purchase Price to Acquire Additional Interest in Planned Natural Gas Pipeline Paid at Closing	15.3
Operator Ownership Interest in Proposed LNG Terminal and Pipeline Project Subsequent to Sell-down	40.00%
Company's Interest in Proposed LNG Terminal and Pipeline Project Subsequent to Sell-down	30.00%
Interest in Proposed LNG Terminal and Pipeline Project Acquired by Third-party in Sell-down Transactions	30.00%
Estimated Proceeds from Sales of Producing Properties and Acreage an Certain Midstream Assets	$ 944

Additional Ownership Interest Acquired by Company in Planned Natural Gas Pipeline

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- Definition

Company's interest in proposed LNG Terminal and pipeline project subsequent to sell-down.

+ Details

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Estimated proceeds from the sale of producing properties and acreage, primarily in the Rocky Mountain area and Texas, and a portion of the interest in the Kitimat LNG Terminal and PTP.

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- Definition

Interest in LNG Terminal and pipeline project acquired by third-party in sell-down transactions.

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Operator ownership interest in proposed LNG Terminal and pipeline project subsequent to sell down.

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Total purchase price to acquire additional interest in planned natural gas pipeline.

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