Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating Revenues and Other
Total	$ 4,139,000,000	$ 1,103,000,000	$ 7,833,000,000	$ 5,821,000,000
Operating Expenses
Lease and Well	270,000,000	245,000,000	540,000,000	575,000,000
Transportation Costs	214,000,000	152,000,000	416,000,000	360,000,000
Gathering and Processing Costs	128,000,000	97,000,000	267,000,000	225,000,000
Exploration Costs	35,000,000	27,000,000	68,000,000	67,000,000
Dry Hole Costs	13,000,000	0	24,000,000	0
Impairments	44,000,000	305,000,000	88,000,000	1,878,000,000
Marketing Costs	991,000,000	444,000,000	1,829,000,000	1,554,000,000
Depreciation, Depletion and Amortization	914,000,000	707,000,000	1,814,000,000	1,707,000,000
General and Administrative	120,000,000	132,000,000	230,000,000	246,000,000
Taxes Other Than Income	239,000,000	81,000,000	454,000,000	238,000,000
Total	2,968,000,000	2,190,000,000	5,730,000,000	6,850,000,000
Operating Income (Loss)	1,171,000,000	(1,087,000,000)	2,103,000,000	(1,029,000,000)
Other Income (Expense), Net	(2,000,000)	(4,000,000)	(6,000,000)	14,000,000
Income (Loss) Before Interest Expense and Income Taxes	1,169,000,000	(1,091,000,000)	2,097,000,000	(1,015,000,000)
Interest Expense
Interest Expense, Net	45,000,000	54,000,000	92,000,000	99,000,000
Income (Loss) Before Income Taxes	1,124,000,000	(1,145,000,000)	2,005,000,000	(1,114,000,000)
Income Tax Provision (Benefit)	217,000,000	(235,000,000)	421,000,000	(214,000,000)
Net Income (Loss)	$ 907,000,000	$ (910,000,000)	$ 1,584,000,000	$ (900,000,000)
Net Income (Loss) Per Share
Basic	$ 1.56	$ (1.57)	$ 2.73	$ (1.55)
Diluted	$ 1.55	$ (1.57)	$ 2.72	$ (1.55)
Average Number of Common Shares
Basic	580,000	579,000	580,000	579,000
Diluted	584,000	579,000	583,000	579,000
Other Comprehensive Loss
Foreign Currency Translation Adjustments	$ (1,000,000)	$ (2,000,000)	$ (3,000,000)	$ 0
Other, Net of Tax	0	0	0	0
Other Comprehensive Loss	(1,000,000)	(2,000,000)	(3,000,000)	0
Comprehensive Income (Loss)	906,000,000	(912,000,000)	1,581,000,000	(900,000,000)
Crude Oil and Condensate
Operating Revenues and Other
Revenues	2,699,000,000	615,000,000	4,950,000,000	2,680,000,000
Natural Gas Liquids
Operating Revenues and Other
Revenues	367,000,000	93,000,000	681,000,000	254,000,000
Natural Gas
Operating Revenues and Other
Revenues	404,000,000	141,000,000	1,029,000,000	351,000,000
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts
Operating Revenues and Other
Revenues	(427,000,000)	(127,000,000)	(794,000,000)	1,079,000,000
Gathering, Processing and Marketing
Operating Revenues and Other
Revenues	1,022,000,000	362,000,000	1,870,000,000	1,401,000,000
Gains (Losses) on Asset Dispositions, Net
Operating Revenues and Other
Revenues	51,000,000	14,000,000	45,000,000	30,000,000
Other, Net
Operating Revenues and Other
Revenues	$ 23,000,000	$ 5,000,000	$ 52,000,000	$ 26,000,000