Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash Flows from Operating Activities
Net Income	$ 719,787	$ 429,547
Items Not Requiring (Providing) Cash
Depreciation, Depletion and Amortization	1,557,508	1,171,170
Impairments	187,364	447,982
Stock-Based Compensation Expenses	55,466	53,427
Deferred Income Taxes	278,826	206,130
Gains on Asset Dispositions, Net	(180,758)	(235,513)
Other, Net	(3,404)	(834)
Dry Hole Costs	11,081	24,627
Mark-to-Market Commodity Derivative Contracts
Total Gains	322,657	122,875
Realized Gains	306,780	31,285
Excess Tax Benefits from Stock-Based Compensation	(22,115)	0
Other, Net	9,890	13,268
Changes in Components of Working Capital and Other Assets and Liabilities
Accounts Receivable	115,419	(165,300)
Inventories	(103,576)	(127,062)
Accounts Payable	176,355	189,250
Accrued Taxes Payable	14,363	94,311
Other Assets	(102,303)	(4,796)
Other Liabilities	(27,355)	(12,017)
Changes in Components of Working Capital Associated with Investing and Financing Activities	(97,453)	76,640
Net Cash Provided by Operating Activities	2,573,218	2,069,240
Investing Cash Flows
Additions to Oil and Gas Properties	(3,748,278)	(3,122,567)
Additions to Other Property, Plant and Equipment	(315,542)	(340,140)
Proceeds from Sales of Assets	1,111,517	944,481
Changes in Components of Working Capital Associated with Investing Activities	97,746	(76,852)
Net Cash Used in Investing Activities	(2,854,557)	(2,595,078)
Financing Cash Flows
Common Stock Sold	0	1,388,270
Dividends Paid	(88,892)	(81,562)
Excess Tax Benefits from Stock-Based Compensation	22,115	0
Treasury Stock Purchased	(22,663)	(16,736)
Proceeds from Stock Options Exercised and Employee Stock Purchase Plan	32,986	24,619
Other, Net	(293)	212
Net Cash (Used in) Provided by Financing Activities	(56,747)	1,314,803
Effect of Exchange Rate Changes on Cash	2,734	(380)
(Decrease) Increase in Cash and Cash Equivalents	(335,352)	788,585
Cash and Cash Equivalents at Beginning of Period	615,726	788,853
Cash and Cash Equivalents at End of Period	$ 280,374	$ 1,577,438