Consolidated Statements of Income and Comprehensive Income shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares		Dec. 31, 2019 USD ($) $ / shares shares		Dec. 31, 2018 USD ($) $ / shares shares
Total	$ 11,032,048		$ 17,379,973		$ 17,275,399
Net Income (Loss)	$ (604,572)		$ 2,734,910		$ 3,419,040
Diluted | $ / shares	$ (1.04)		$ 4.71		$ 5.89
Basic | $ / shares	$ (1.04)		$ 4.73		$ 5.93
Basic (in shares) | shares	578,949		577,670		576,578
Diluted (in shares) | shares	578,949		580,777		580,441
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ (612,248)		$ 2,731,349		$ 3,436,979
Other Comprehensive Income (Loss)	(7,676)		(3,561)		17,939
Accounts Receivable, after Allowance for Credit Loss, Current	1,337,000		1,619,000		1,460,000
Other, Net of Tax	(330)		(678)		1,123
Foreign Currency Translation Adjustments	(7,346)		(2,883)		16,816
Operating Expenses
Lease and Well	1,063,374		1,366,993		1,282,678
Transportation Costs	734,989	[1]	758,300	[1]	746,876	[1]
Gathering and Processing Costs	459,211	[1]	479,102	[1]	436,973
Exploration Costs	145,788		139,881		148,999
Dry Hole Costs	13,083	[1]	28,001	[1]	5,405	[1]
Impairments	2,099,780		517,896		347,021
Marketing Costs	2,697,729		5,351,524		5,203,243
Depreciation, Depletion and Amortization	3,400,353		3,749,704		3,435,408
General and Administrative	483,823		489,397		426,969
Taxes Other Than Income	477,934		800,164		772,481
Total	11,576,064		13,680,962		12,806,053
Operating Income (Loss)	(544,016)		3,699,011		4,469,346
Other Income, Net	10,228		31,385		16,704
Income (Loss) Before Interest Expense and Income Taxes	(533,788)		3,730,396		4,486,050
Interest Expense
Incurred	236,154		223,421		269,549
Capitalized	(30,888)		(38,292)		(24,497)
Net Interest Expense	205,266		185,129		245,052
Income (Loss) Before Income Taxes	(739,054)		3,545,267		4,240,998
Income Tax Provision (Benefit)	(134,482)		810,357		821,958
Net Income (Loss)	$ (604,572)		$ 2,734,910		$ 3,419,040
Net Income (Loss) Per Share
Basic | $ / shares	$ (1.04)		$ 4.73		$ 5.93
Diluted | $ / shares	$ (1.04)		$ 4.71		$ 5.89
Average Number of Common Shares [Abstract]
Basic (in shares) | shares	578,949		577,670		576,578
Diluted (in shares) | shares	578,949		580,777		580,441
Other Comprehensive Income (Loss)
Foreign Currency Translation Adjustments	$ (7,346)		$ (2,883)		$ 16,816
Other, Net of Tax	(330)		(678)		1,123
Other Comprehensive Income (Loss)	(7,676)		(3,561)		17,939
Comprehensive Income (Loss)	(612,248)		2,731,349		3,436,979
Crude Oil and Condensate
Revenues	5,785,609		9,612,532		9,517,440
Natural Gas Liquids
Revenues	667,514		784,818		1,127,510
Natural Gas
Revenues	837,133		1,184,095		1,301,537
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts
Revenues	1,144,737		180,275		(165,640)
Gathering, Processing and Marketing
Revenues	2,582,984		5,360,282		5,230,355
Gains (Losses) on Asset Dispositions, Net
Revenues	(46,883)		123,613		174,562
Other, Net
Revenues	$ 60,954		$ 134,358		$ 89,635

[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, 2020.