Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash Flows from Operating Activities
Net Income (Loss)	$ (164,480)	$ 1,367,281
Items Not Requiring (Providing) Cash
Depreciation, Depletion and Amortization	1,822,015	1,943,093
Impairments	137,955	152,396
Stock-Based Compensation Expenses	61,650	65,144
Deferred Income Taxes	(154,803)	479,109
(Gains) Losses on Asset Dispositions, Net	3,957	(15,354)
Other, Net	6,787	984
Dry Hole Costs	14,119	13,906
Mark-to-Market Commodity Derivative Contracts
Total (Gains) Losses	(27,715)	385,006
Net Cash Received from (Payments for) Settlements of Commodity Derivative Contracts	561,142	(120,900)
Excess Tax Benefits from Stock-Based Compensation	(16,393)	(63,759)
Other, Net	6,346	7,223
Changes in Components of Working Capital and Other Assets and Liabilities
Accounts Receivable	298,183	(249,336)
Inventories	37,609	(109,756)
Accounts Payable	(999,644)	347,539
Accrued Taxes Payable	64,124	115,668
Other Assets	76,114	(141,453)
Other Liabilities	(48,848)	57,101
Changes in Components of Working Capital Associated with Investing and Financing Activities	169,802	(31,644)
Net Cash Provided by Operating Activities	1,847,920	4,202,248
Investing Cash Flows
Additions to Oil and Gas Properties	(2,611,848)	(3,724,486)
Additions to Other Property, Plant and Equipment	(201,597)	(402,972)
Proceeds from Sales of Assets	116,166	74,512
Changes in Restricted Cash	0	(91,238)
Changes in Components of Working Capital Associated with Investing Activities	(169,903)	31,620
Net Cash Used in Investing Activities	(2,867,182)	(4,112,564)
Financing Cash Flows
Long-Term Debt Borrowings	990,225	496,220
Long-Term Debt Repayments	(500,000)	(500,000)
Settlement of Foreign Currency Swap	0	(31,573)
Dividends Paid	(183,130)	(119,684)
Excess Tax Benefits from Stock-Based Compensation	16,393	63,759
Treasury Stock Purchased	(26,362)	(89,524)
Proceeds from Stock Options Exercised and Employee Stock Purchase Plan	14,484	10,433
Debt Issuance Costs	(1,585)	(895)
Repayment of Capital Lease Obligation	(3,053)	(2,958)
Other, Net	101	24
Net Cash Provided by (Used in) Financing Activities	307,073	(174,198)
Effect of Exchange Rate Changes on Cash	(7,629)	(3,555)
Decrease in Cash and Cash Equivalents	(719,818)	(88,069)
Cash and Cash Equivalents at Beginning of Period	2,087,213	1,318,209
Cash and Cash Equivalents at End of Period	$ 1,367,395	$ 1,230,140