Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash Flows from Operating Activities
Net Income	$ 1,616,915	$ 1,075,278
Items Not Requiring (Providing) Cash
Depreciation, Depletion and Amortization	2,685,719	2,383,359
Impairments	177,432	250,239
Stock-Based Compensation Expenses	103,171	101,337
Deferred Income Taxes	657,686	385,878
Gains on Asset Dispositions, Net	(185,569)	(248,134)
Other, Net	460	(10,266)
Dry Hole Costs	59,260	13,005
Mark-to-Market Commodity Derivative Contracts
Total Losses (Gains)	206,853	(327,328)
Realized Gains	115,323	555,946
Excess Tax Benefits from Stock-Based Compensation	(50,230)	(49,426)
Other, Net	16,222	12,675
Changes in Components of Working Capital and Other Assets and Liabilities
Accounts Receivable	(213,746)	(112,174)
Inventories	61,147	(154,766)
Accounts Payable	145,199	83,682
Accrued Taxes Payable	73,197	42,791
Other Assets	(78,799)	(120,085)
Other Liabilities	10,889	39,871
Changes in Components of Working Capital Associated with Investing and Financing Activities	(72,945)	87,708
Net Cash Provided by Operating Activities	5,328,184	4,009,590
Investing Cash Flows
Additions to Oil and Gas Properties	(5,084,335)	(5,326,884)
Additions to Other Property, Plant and Equipment	(271,136)	(477,351)
Proceeds from Sales of Assets	587,273	1,213,550
Changes in Restricted Cash	(68,061)	0
Changes in Components of Working Capital Associated with Investing Activities	72,916	(87,654)
Net Cash Used in Investing Activities	(4,763,343)	(4,678,339)
Financing Cash Flows
Long-Term Debt Borrowings	0	1,234,138
Dividends Paid	(147,731)	(134,412)
Excess Tax Benefits from Stock-Based Compensation	50,230	49,426
Treasury Stock Purchased	(55,562)	(44,799)
Proceeds from Stock Options Exercised and Employee Stock Purchase Plan	30,080	59,714
Debt Issuance Costs	0	(1,771)
Repayment of Capital Lease Obligation	(4,318)	(1,407)
Other, Net	29	(54)
Net Cash (Used in) Provided by Financing Activities	(127,272)	1,160,835
Effect of Exchange Rate Changes on Cash	4,813	4,811
Increase in Cash and Cash Equivalents	442,382	496,897
Cash and Cash Equivalents at Beginning of Period	876,435	615,726
Cash and Cash Equivalents at End of Period	$ 1,318,817	$ 1,112,623