Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Cash Flows from Operating Activities
Net Income	$ 429,547	$ 177,887
Items Not Requiring (Providing) Cash
Depreciation, Depletion and Amortization	1,171,170	897,249
Impairments	447,982	149,957
Stock-Based Compensation Expenses	53,427	44,953
Deferred Income Taxes	206,130	24,493
Gains on Asset Dispositions, Net	(235,513)	(7,632)
Other, Net	(834)	(1,252)
Dry Hole Costs	24,627	42,395
Mark-to-Market Commodity Derivative Contracts
Total Gains	122,875	44,818
Realized Gains	31,285	38,827
Other, Net	13,268	8,454
Changes in Components of Working Capital and Other Assets and Liabilities
Accounts Receivable	(165,300)	(39,275)
Inventories	(127,062)	(67,363)
Accounts Payable	189,250	254,878
Accrued Taxes Payable	94,311	(6,011)
Other Assets	(4,796)	(24,499)
Other Liabilities	(12,017)	(10,930)
Changes in Components of Working Capital Associated with Investing and Financing Activities	76,640	(135,973)
Net Cash Provided by Operating Activities	2,069,240	1,301,340
Investing Cash Flows
Additions to Oil and Gas Properties	(3,122,567)	(2,288,270)
Additions to Other Property, Plant and Equipment	(340,140)	(115,661)
Proceeds from Sales of Assets	944,481	41,939
Changes in Components of Working Capital Associated with Investing Activities	(76,852)	135,693
Other, Net	0	4,157
Net Cash Used in Investing Activities	(2,595,078)	(2,230,456)
Financing Cash Flows
Common Stock Sold	1,388,270	0
Long-Term Debt Borrowings	0	991,395
Long-Term Debt Repayments	0	(37,000)
Dividends Paid	(81,562)	(75,179)
Treasury Stock Purchased	(16,736)	(7,307)
Proceeds from Stock Options Exercised and Employee Stock Purchase Plan	24,619	21,023
Debt Issuance Costs	0	(1,194)
Other, Net	212	280
Net Cash Provided by Financing Activities	1,314,803	892,018
Effect of Exchange Rate Changes on Cash	(380)	1,461
Increase (Decrease) in Cash and Cash Equivalents	788,585	(35,637)
Cash and Cash Equivalents at Beginning of Period	788,853	685,751
Cash and Cash Equivalents at End of Period	$ 1,577,438	$ 650,114

The net change during the reporting period of all current assets and liabilities used in investing and financing activities.

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The net gain or loss resulting from the sale, transfer, termination, or other disposition of assets during the period, excluding transactions involving capital leases, assets-held- or available-for-lease, and other real estate owned which, to the extend appropriate, are included in gains (losses) on the disposition of assets in nonoperating income (expense).

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The net change during the period in the amount of cash payments due to taxinf authorities.

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The cash inflows/outflows from operating activities not classfied elsewhere.

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This element reflects realized gain (loss) on the settlement of financial commodity derivative instruments.

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Transactions that do not result in cash inflows or outflows in the period in which they occur, but affect net income and thus are removed when calculating net cash flow from operating activities using the indirect cash flow method. This element is used when there is not a more specific and appropriate element.

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents.

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The net change between the beginning and ending balance of cash and cash equivalents.

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The component of income tax expense for the period representing the net change in the entity's deferred tax assets and liabilities pertaining to continuing operations.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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The effect of exchange rate changes on cash balances held in foreign currencies.

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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 net change during the reporting period in the aggregate amount of obligations due within one year (or one business cycle). This may include trade payables, amounts due to related parties, royalties payable, and other obligations.

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The net change during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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The net change during the reporting period in other operating assets not otherwise defined in the taxonomy.

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The net change during the reporting period in other operating obligations not otherwise defined in the taxonomy.

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The net change during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.

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The net cash inflow (outflow) from financing activity for the period.

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The net cash inflow (outflow) from investing activity.

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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities.

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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities include all transactions and events that are not defined as investing or financing activities. Operating activities generally involve producing and delivering goods and providing services. Cash flows from operating activities are generally the cash effects of transactions and other events that enter into the determination of net income.

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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The net cash outflow (inflow) from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash outflow to reacquire common stock during the period.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The cash outflow from distribution of an entity's earnings to common and preferred stockholders, including minority shareholders. This element excludes special dividends, which are included in a separate element for capital distributions.

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The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale.

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The cash outflow for acquisition of or capital improvements of property, plant and equipment, used to produce goods or deliver services, and not otherwise defined in the taxonomy.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash inflow from the issuance of common, preferred, and treasury stocks, stock options, and such forth.

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The net cash inflow (outflow) from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash inflow to dispose of long lived physical asset and mineral interests in oil and gas properties use for the normal oil and gas operation.

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The cash inflow associated with the amount received from holders exercising their stock options.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Dry hole costs from oil and gas producing activities

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock options, amortization of restricted stock, and adjustment for officers compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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The aggregate increase (decrease) in the market value of open derivatives, commodity, or energy contracts. These gains (losses) are included in earnings.

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