Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash Flows from Operating Activities
Net Income	$ 660,928	$ 494,725
Items Not Requiring (Providing) Cash
Depreciation, Depletion and Amortization	946,491	846,388
Impairments	113,361	53,548
Stock-Based Compensation Expenses	35,565	30,436
Deferred Income Taxes	232,808	200,779
Gains on Asset Dispositions, Net	(11,498)	(164,233)
Other, Net	5,442	8,268
Dry Hole Costs	8,348	3,962
Mark-to-Market Commodity Derivative Contracts
Total Losses	155,736	104,956
Net Cash (Payments for) Received from Settlements of Commodity Derivative Contracts	(34,033)	67,050
Excess Tax Benefits from Stock-Based Compensation	(27,422)	(11,673)
Other, Net	3,589	5,022
Changes in Components of Working Capital and Other Assets and Liabilities
Accounts Receivable	(144,317)	(236,757)
Inventories	(68,948)	(15,058)
Accounts Payable	361,810	186,065
Accrued Taxes Payable	139,801	9,004
Other Assets	(12,536)	(47,193)
Other Liabilities	(29,169)	(52,933)
Changes in Components of Working Capital Associated with Investing and Financing Activities	(68,283)	(57,421)
Net Cash Provided by Operating Activities	2,267,673	1,424,935
Investing Cash Flows
Additions to Oil and Gas Properties	(1,736,630)	(1,604,123)
Additions to Other Property, Plant and Equipment	(165,966)	(92,201)
Proceeds from Sales of Assets	19,825	479,436
Changes in Restricted Cash	(9,047)	0
Changes in Components of Working Capital Associated with Investing Activities	68,258	57,149
Net Cash Used in Investing Activities	(1,823,560)	(1,159,739)
Financing Cash Flows
Long-Term Debt Borrowings	496,220	0
Long-Term Debt Repayments	(500,000)	0
Settlement of Foreign Currency Swap	(31,573)	0
Dividends Paid	(51,780)	(46,220)
Excess Tax Benefits from Stock-Based Compensation	27,422	11,673
Treasury Stock Purchased	(28,897)	(11,024)
Proceeds from Stock Options Exercised	985	8,004
Debt Issuance Costs	(942)	0
Repayment of Capital Lease Obligation	(1,474)	(1,427)
Other, Net	25	272
Net Cash Used in Financing Activities	(90,014)	(38,722)
Effect of Exchange Rate Changes on Cash	(5,096)	5,125
Increase in Cash and Cash Equivalents	349,003	231,599
Cash and Cash Equivalents at Beginning of Period	1,318,209	876,435
Cash and Cash Equivalents at End of Period	$ 1,667,212	$ 1,108,034