Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Operating Activities
Net Income (Loss)		$ 3,419,040	$ 2,582,579	$ (1,096,686)
Items Not Requiring (Providing) Cash
Depreciation, Depletion and Amortization		3,435,408	3,409,387	3,553,417
Impairments		347,021	479,240	620,267
Stock-Based Compensation Expenses		155,337	133,849	128,090
Deferred Income Taxes		894,156	(1,473,872)	(515,206)
(Gains) Losses on Asset Dispositions, Net		(174,562)	99,096	(205,835)
Other, Net		7,066	6,546	61,690
Dry Hole Costs	[1]	5,405	4,609	10,657
Mark-to-Market Commodity Derivative Contracts
Total (Gains) Losses		165,640	(19,828)	99,608
Net Cash Received from (Payments for) Settlements of Commodity Derivative Contracts		(258,906)	7,438	(22,219)
Excess Tax Benefits from Stock-Based Compensation		0	0	(29,357)
Other, Net		3,108	1,204	10,971
Changes in Components of Working Capital and Other Assets and Liabilities
Accounts Receivable		(368,180)	(392,131)	(232,799)
Inventories		(395,408)	(174,548)	170,694
Accounts Payable		439,347	324,192	(74,048)
Accrued Taxes Payable		(92,461)	(63,937)	92,782
Other Assets		(125,435)	(658,609)	(40,636)
Other Liabilities		10,949	(89,871)	(16,225)
Changes in Components of Working Capital Associated with Investing and Financing Activities		301,083	89,992	(156,102)
Net Cash Provided by Operating Activities		7,768,608	4,265,336	2,359,063
Investing Cash Flows
Additions to Oil and Gas Properties		(5,839,294)	(3,950,918)	(2,489,756)
Additions to Other Property, Plant and Equipment		(237,181)	(173,324)	(93,039)
Proceeds from Sales of Assets		227,446	226,768	1,119,215
Payments to Acquire Businesses, Net of Cash Acquired		0	0	54,534
Payments for (Proceeds from) Other Investing Activities		(19,993)	0	0
Changes in Components of Working Capital Associated with Investing Activities		(301,140)	(89,935)	156,102
Net Cash Used in Investing Activities		(6,170,162)	(3,987,409)	(1,252,944)
Financing Cash Flows
Net Commercial Paper (Repayments) Borrowings		0	0	(259,718)
Long-Term Debt Borrowings		0	0	991,097
Long-Term Debt Repayments		(350,000)	(600,000)	(563,829)
Dividends Paid		(438,045)	(386,531)	(372,845)
Excess Tax Benefits from Stock-Based Compensation		0	0	29,357
Treasury Stock Purchased		(63,456)	(63,408)	(82,125)
Proceeds from Stock Options Exercised and Employee Stock Purchase Plan		20,560	20,840	23,296
Debt Issuance Costs		0	0	(1,602)
Repayment of Capital Lease Obligation		(8,219)	(6,555)	(6,353)
Other, Net		57	(57)	0
Net Cash Used in Financing Activities		(839,103)	(1,035,711)	(242,722)
Effect of Exchange Rate Changes on Cash		(37,937)	(7,883)	17,992
Increase (Decrease) in Cash and Cash Equivalents		721,406	(765,667)	881,389
Cash and Cash Equivalents at Beginning of Year		834,228	1,599,895	718,506
Cash and Cash Equivalents at End of Year		$ 1,555,634	$ 834,228	$ 1,599,895

[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, 2018.