Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Operating Revenues and Other
Total		$ 18,642		$ 11,032		$ 17,380
Operating Expenses
Lease and Well		1,135		1,063		1,367
Transportation Costs	[1]	863		735		758
Gathering and Processing Costs		559	[1]	459	[1]	479
Exploration Costs		154		146		140
Dry Hole Costs	[1]	71		13		28
Impairments		376		2,100		518
Marketing Costs		4,173		2,698		5,352
Depreciation, Depletion and Amortization		3,651		3,400		3,750
General and Administrative		511		484		489
Taxes Other Than Income		1,047		478		800
Total		12,540		11,576		13,681
Operating Income (Loss)		6,102		(544)		3,699
Other Income, Net		9		10		31
Income (Loss) Before Interest Expense and Income Taxes		6,111		(534)		3,730
Interest Expense
Incurred		211		236		223
Capitalized		(33)		(31)		(38)
Net Interest Expense		178		205		185
Income (Loss) Before Income Taxes		5,933		(739)		3,545
Income Tax Provision (Benefit)		1,269		(134)		810
Net Income (Loss)		$ 4,664		$ (605)		$ 2,735
Net Income (Loss) Per Share
Basic		$ 8.03		$ (1.04)		$ 4.73
Diluted		$ 7.99		$ (1.04)		$ 4.71
Average Number of Common Shares [Abstract]
Basic (in shares)		581		579		578
Diluted (in shares)		584		579		581
Other Comprehensive Income (Loss)
Foreign Currency Translation Adjustments		$ (1)		$ (7)		$ (3)
Other, Net of Tax		1		0		0
Other Comprehensive Loss		0		(7)		(3)
Comprehensive Income (Loss)		4,664		(612)		2,732
Crude Oil and Condensate
Operating Revenues and Other
Revenues		11,125		5,786		9,613
Natural Gas Liquids
Operating Revenues and Other
Revenues		1,812		668		785
Natural Gas
Operating Revenues and Other
Revenues		2,444		837		1,184
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts
Operating Revenues and Other
Revenues		(1,152)		1,145		180
Gathering, Processing and Marketing
Operating Revenues and Other
Revenues		4,288		2,583		5,360
Gains (Losses) on Asset Dispositions, Net
Operating Revenues and Other
Revenues		17		(47)		124
Other, Net
Operating Revenues and Other
Revenues		$ 108		$ 60		$ 134

[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, 2021.