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Commitments And Contingencies (Details) (USD $)	Jun. 30, 2011	Jun. 20, 2011	Dec. 31, 2010
Commitment for long-term lease contract			$ 600,000,000
Issued court judgment		196,000,000
Recorded liability due to court judgment	133,000,000
Recorded receivable due to indemnification agreement	133,000,000
Devon [Member]
Issued court judgment		$ 133,000,000

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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