Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows from Operating Activities
Net Income (Loss)		$ (4,524,515)	$ 2,915,487	$ 2,197,109
Items Not Requiring (Providing) Cash
Depreciation, Depletion and Amortization		3,313,644	3,997,041	3,600,976
Impairments		6,613,546	743,575	286,941
Stock-Based Compensation Expenses		130,577	145,086	134,055
Deferred Income Taxes		(2,482,307)	1,704,946	874,765
(Gains) Losses on Asset Dispositions, Net		8,798	(507,590)	(197,565)
Other, Net		11,896	48,138	11,072
Dry Hole Costs	[1]	14,746	48,490	74,655
Mark-to-Market Commodity Derivative Contracts
Total (Gains) Losses		(61,924)	(834,273)	166,349
Net Cash Received from Settlements of Commodity Derivative Contracts		730,114	34,007	116,361
Excess Tax Benefits from Stock-Based Compensation		(26,058)	(99,459)	(55,831)
Other, Net		12,532	13,009	18,205
Changes in Components of Working Capital and Other Assets and Liabilities
Accounts Receivable		641,412	84,982	(23,613)
Inventories		58,450	(161,958)	53,402
Accounts Payable		(1,409,197)	543,630	178,701
Accrued Taxes Payable		11,798	16,486	75,142
Other Assets		118,143	(14,448)	(109,567)
Other Liabilities		(66,257)	75,420	(20,382)
Changes in Components of Working Capital Associated with Investing and Financing Activities		499,767	(103,414)	(51,361)
Net Cash Provided by Operating Activities		3,595,165	8,649,155	7,329,414
Investing Cash Flows
Additions to Oil and Gas Properties		(4,725,150)	(7,519,667)	(6,697,091)
Additions to Other Property, Plant and Equipment		(288,013)	(727,138)	(363,536)
Proceeds from Sales of Assets		192,807	569,332	760,557
Changes in Restricted Cash		0	60,385	(65,814)
Changes in Components of Working Capital Associated with Investing Activities		(499,900)	103,523	51,106
Net Cash Used in Investing Activities		(5,320,256)	(7,513,565)	(6,314,778)
Financing Cash Flows
Proceeds from Issuance of Commercial Paper		259,718	0	0
Long-Term Debt Borrowings		990,225	496,220	0
Long-Term Debt Repayments		(500,000)	(500,000)	(400,000)
Settlement of Foreign Currency Swap		0	(31,573)	0
Dividends Paid		(367,005)	(279,695)	(199,178)
Excess Tax Benefits from Stock-Based Compensation		26,058	99,459	55,831
Treasury Stock Purchased		(48,791)	(127,424)	(63,784)
Proceeds from Stock Options Exercised and Employee Stock Purchase Plan		22,690	22,249	38,730
Debt Issuance Costs		(5,951)	(895)	0
Repayment of Capital Lease Obligation		(6,156)	(5,966)	(5,780)
Other, Net		133	(109)	255
Net Cash Provided by (Used in) Financing Activities		370,921	(327,734)	(573,926)
Effect of Exchange Rate Changes on Cash		(14,537)	(38,852)	1,064
Increase (Decrease) in Cash and Cash Equivalents		(1,368,707)	769,004	441,774
Cash and Cash Equivalents at Beginning of Year		2,087,213	1,318,209	876,435
Cash and Cash Equivalents at End of Year		$ 718,506	$ 2,087,213	$ 1,318,209

[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, 2015.