Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows from Operating Activities
Net Income	$ 2,526,272	$ 152,111
Items Not Requiring (Providing) Cash
Depreciation, Depletion and Amortization	2,515,445	2,527,642
Impairments	160,934	325,798
Stock-Based Compensation Expenses	116,290	101,537
Deferred Income Taxes	681,702	114,850
Gains (Losses) on Asset Dispositions, Net	94,658	(33,876)
Other, Net	15,314	(4,514)
Dry Hole Costs	5,260	77
Mark-to-Market Commodity Derivative Contracts
Total (Gains) Losses	297,735	(64,860)
Net Cash Received from (Payments for) Settlements of Commodity Derivative Contracts	(180,228)	4,730
Other, Net	1,652	270
Changes in Components of Working Capital and Other Assets and Liabilities
Accounts Receivable	(553,529)	(25,445)
Inventories	(286,817)	(17,674)
Accounts Payable	537,525	112,894
Accrued Taxes Payable	(36,891)	(49,967)
Other Assets	(103,334)	(83,940)
Other Liabilities	(14,776)	(69,224)
Changes in Components of Working Capital Associated with Investing and Financing Activities	95,484	(120,373)
Net Cash Provided by Operating Activities	5,683,380	2,937,788
Investing Cash Flows
Additions to Oil and Gas Properties	(4,571,932)	(2,927,988)
Additions to Other Property, Plant and Equipment	(202,384)	(139,558)
Proceeds from Sales of Assets	11,582	191,593
Other Investing Activities	(19,993)	0
Changes in Components of Working Capital Associated with Investing Activities	(95,541)	120,469
Net Cash Used in Investing Activities	(4,878,268)	(2,755,484)
Financing Cash Flows
Long-term Debt Repayments	0	(600,000)
Dividends Paid	(311,075)	(289,261)
Treasury Stock Purchased	(58,558)	(50,374)
Proceeds from Stock Options Exercised and Employee Stock Purchase Plan	12,098	11,174
Repayment of Capital Lease Obligation	(5,052)	(4,897)
Changes in Components of Working Capital Associated with Financing Activities	57	(96)
Net Cash Used in Financing Activities	(362,530)	(933,454)
Effect of Exchange Rate Changes on Cash	(2,678)	(2,607)
Increase (Decrease) in Cash and Cash Equivalents	439,904	(753,757)
Cash and Cash Equivalents at Beginning of Period	834,228	1,599,895
Cash and Cash Equivalents at End of Period	$ 1,274,132	$ 846,138