Basis of Presentation and Significant Accounting Policies (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of Significant Accounting Policies (Details)
Estimated future hurricane repair expenses	$ 14	$ 0
Insurance proceeds associated with Hurricane Ike damage	8		48
Pretax insurance gains credited to earnings			2
Insurance proceeds received under settlement agreement			40
Anticipated insurance recoveries reflected as receivables	1	1
Insurance gains credited to earnings			2
Fair value of Senior Notes	327	332
Carrying value of Senior Notes	305	305
Cash paid for liquidation of hedge contract		14
Impairments of oil and gas properties	$ 0	$ 15	$ 64
Aggregate percentage of sold reserves		95.00%

The aggregate amount of proved reserves sold to third parties.

No definition available.

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Estimated remaining hurricane related damage assessment costs and repair expenses accrued in decommissioning liabilities, net of anticipated insurance recoveries.

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Amount of insurance proceeds collected associated with hurricane damaged properties including the settlement of certain coverage at less than the applicable coverage limits.

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No definition available.

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Amount received from insurers pursuant to a settlement agreement.

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No definition available.

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The excess or deficiency of insurance recoveries compared to the recorded loss incurred from an insured event (including a conversion of nonmonetary assets to monetary assets). An excess would occur from recovery of lost profits, and recoveries at current replacement cost less carrying amounts of assets that were damaged or destroyed. This element is (1) intended to be used whenever a relevant insurance event concept is needed and (2) moved to the portion of the income statement to correspond to the entity's classification as a component of operating results, nonoperating item, discontinued operations, or extraordinary item.

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Net of tax amount of gain (loss) classified as extraordinary item, including amount attributable to noncontrolling interests.

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-Glossary Extraordinary Items

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The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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The carrying amount as of the balance sheet date of a recorded receivable related to a loss contingency accrual. For example, an insurance recovery receivable to the extent that the insurance recovery is probable and does not exceed the amount of the loss previously recognized in the financial statements.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents notes payable as of the balance sheet date.

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