Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash Flows from Operating Activities
Net Income (Loss)	$ 2,679,000	$ (942,000)
Items Not Requiring (Providing) Cash
Depreciation, Depletion and Amortization	2,741,000	2,530,000
Impairments	170,000	1,957,000
Stock-Based Compensation Expenses	117,000	113,000
Deferred Income Taxes	(244,000)	(241,000)
(Gains) Losses on Asset Dispositions, Net	(46,000)	41,000
Other, Net	15,000	2,000
Dry Hole Costs	28,000	13,000
Mark-to-Market Commodity Derivative Contracts
Total (Gains) Losses	1,288,000	(1,075,000)
Net Cash Received from (Payments for) Settlements of Commodity Derivative Contracts	(516,000)	999,000
Other, Net	8,000	(1,000)
Changes in Components of Working Capital and Other Assets and Liabilities
Accounts Receivable	(639,000)	931,000
Inventories	95,000	92,000
Accounts Payable	115,000	(1,222,000)
Accrued Taxes Payable	286,000	12,000
Other Assets	(55,000)	415,000
Other Liabilities	(317,000)	(13,000)
Changes in Components of Working Capital Associated with Investing and Financing Activities	(100,000)	276,000
Net Cash Provided by Operating Activities	5,625,000	3,887,000
Investing Cash Flows
Additions to Oil and Gas Properties	(2,689,000)	(2,459,000)
Additions to Other Property, Plant and Equipment	(147,000)	(165,000)
Proceeds from Sales of Assets	154,000	189,000
Changes in Components of Working Capital Associated with Investing Activities	100,000	(276,000)
Net Cash Used in Investing Activities	(2,582,000)	(2,711,000)
Financing Cash Flows
Long-Term Debt Borrowings	0	1,484,000
Long-Term Debt Repayments	(750,000)	(1,000,000)
Dividends Paid	(1,278,000)	(601,000)
Treasury Stock Purchased	(33,000)	(15,000)
Proceeds from Stock Options Exercised	9,000	8,000
Debt Issuance Costs	0	(3,000)
Repayment of Finance Lease Liabilities	(27,000)	(13,000)
Net Cash Used in Financing Activities	(2,079,000)	(140,000)
Effect of Exchange Rate Changes on Cash	0	2,000
Increase in Cash and Cash Equivalents	964,000	1,038,000
Cash and Cash Equivalents at Beginning Period	3,329,000	2,028,000
Cash and Cash Equivalents End of Period	$ 4,293,000	$ 3,066,000