Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating Revenues and Other
Total	$ 4,697,630	$ 4,238,077	$ 8,756,272	$ 7,919,239
Operating Expenses
Lease and Well	347,281	314,604	683,572	614,668
Transportation Costs	174,101	177,797	350,623	354,754
Gathering and Processing Costs	112,643	109,169	223,938	210,514
Exploration Costs	32,522	47,478	68,846	82,314
Dry Hole Costs	3,769	4,902	3,863	4,902
Impairments	112,130	51,708	184,486	116,317
Marketing Costs	1,500,915	1,420,463	2,770,972	2,526,853
Depreciation, Depletion and Amortization	957,304	848,674	1,836,899	1,597,265
General and Administrative	121,780	104,083	228,452	198,781
Taxes Other Than Income	204,414	194,268	397,320	373,352
Total	3,566,859	3,273,146	6,748,971	6,079,720
Operating Income	1,130,771	964,931	2,007,301	1,839,519
Other Income (Expense), Net	8,503	(8,551)	14,115	(7,824)
Income Before Interest Expense and Income Taxes	1,139,274	956,380	2,021,416	1,831,695
Interest Expense
Interest Expense, Net	49,908	63,444	104,814	125,400
Income Before Income Taxes	1,089,366	892,936	1,916,602	1,706,295
Income Tax Provision	241,525	196,205	433,335	370,975
Net Income	$ 847,841	$ 696,731	$ 1,483,267	$ 1,335,320
Net Income Per Share
Basic	$ 1.47	$ 1.21	$ 2.57	$ 2.32
Diluted	$ 1.46	$ 1.20	$ 2.56	$ 2.30
Average Number of Common Shares
Basic	577,460	576,135	577,333	575,953
Diluted	580,247	580,375	580,204	580,007
Other Comprehensive Income (Loss)
Foreign Currency Translation Adjustments	$ (1,665)	$ (3,229)	$ (3,449)	$ 1,773
Other, Net of Tax	6	6	12	12
Other Comprehensive Income (Loss)	(1,659)	(3,223)	(3,437)	1,785
Comprehensive Income	846,182	693,508	1,479,830	1,337,105
Crude Oil and Condensate
Operating Revenues and Other
Revenues	2,528,866	2,377,528	4,729,269	4,478,836
Natural Gas Liquids
Operating Revenues and Other
Revenues	186,374	286,354	405,012	507,769
Natural Gas
Operating Revenues and Other
Revenues	269,892	300,845	604,864	600,611
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts
Operating Revenues and Other
Revenues	177,300	(185,883)	156,720	(245,654)
Gathering, Processing and Marketing
Operating Revenues and Other
Revenues	1,501,386	1,436,436	2,787,040	2,538,258
Gains (Losses) on Asset Dispositions, Net
Operating Revenues and Other
Revenues	8,009	(6,317)	4,173	(21,286)
Other, Net
Operating Revenues and Other
Revenues	$ 25,803	$ 29,114	$ 69,194	$ 60,705