Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
Cash Flows from Operating Activities
Net Income	$ 2,197,109	$ 570,279		$ 1,091,123
Items Not Requiring (Providing) Cash
Depreciation, Depletion and Amortization	3,600,976	3,169,703		2,516,381
Impairments	286,941	1,270,735		1,031,037
Stock-Based Compensation Expenses	134,055	127,778		128,345
Deferred Income Taxes	874,765	292,938		499,300
Gains on Asset Dispositions, Net	(197,565)	(192,660)		(492,909)
Other, Net	11,072	672		15,139
Dry Hole Costs	74,655	14,970	[1]	53,230	[1]
Mark-to-Market Commodity Derivative Contracts
Total (Gains) Losses	166,349	(393,744)		(626,053)
Realized Gains	116,361	711,479		180,701
Excess Tax Benefits from Stock-Based Compensation	(55,831)	(67,035)		0
Other, Net	18,205	14,411		26,454
Changes in Components of Working Capital and Other Assets and Liabilities
Accounts Receivable	(23,613)	(178,683)		(339,780)
Inventories	53,402	(156,762)		(176,623)
Accounts Payable	178,701	(17,150)		351,087
Accrued Taxes Payable	75,142	78,094		92,589
Other Assets	(109,567)	(118,520)		(23,625)
Other Liabilities	(20,382)	36,114		14,986
Changes in Components of Working Capital Associated with Investing and Financing Activities	(51,361)	74,158		237,028
Net Cash Provided by Operating Activities	7,329,414	5,236,777		4,578,410
Investing Cash Flows
Additions to Oil and Gas Properties	(6,697,091)	(6,735,316)		(6,294,397)
Additions to Other Property, Plant and Equipment	(363,536)	(619,800)		(656,415)
Proceeds from Sales of Assets	760,557	1,309,776		1,433,137
Changes in Restricted Cash	(65,814)	0		0
Changes in Components of Working Capital Associated with Investing Activities	51,106	(73,923)		(237,267)
Net Cash Used in Investing Activities	(6,314,778)	(6,119,263)		(5,754,942)
Financing Cash Flows
Common Stock Sold	0	0		1,388,265
Long-Term Debt Borrowings	0	1,234,138		0
Long-Term Debt Repayments	(400,000)	0		(220,000)
Dividends Paid	(199,178)	(181,080)		(167,169)
Excess Tax Benefits from Stock-Based Compensation	55,831	67,035		0
Treasury Stock Purchased	(63,784)	(58,592)		(23,922)
Proceeds from Stock Options Exercised and Employee Stock Purchase Plan	38,730	82,887		35,913
Debt Issuance Costs	0	(1,578)		(4,787)
Repayment of Capital Lease Obligation	(5,780)	(2,824)		0
Other, Net	255	(235)		239
Net Cash Provided by Financing Activities	(573,926)	1,139,751		1,008,539
Effect of Exchange Rate Changes on Cash	1,064	3,444		(5,134)
Increase (Decrease) in Cash and Cash Equivalents	441,774	260,709		(173,127)
Cash and Cash Equivalents at Beginning of Period	876,435	615,726		788,853
Cash and Cash Equivalents at End of Period	$ 1,318,209	$ 876,435		$ 615,726

[1] Excludes gains or losses on the mark-to-market of financial commodity derivative contracts, gains or losses on sales of reserves and related assets, interest charges and general corporate expenses for each of the three years in the period ended December 31, 2013.