Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating Revenues and Other
Total	$ 4,781,624	$ 2,644,844	$ 12,700,863	$ 7,867,881
Operating Expenses
Lease and Well	321,568	251,943	936,236	762,906
Transportation Costs	196,027	183,565	550,781	548,635
Gathering and Processing Costs	114,063	32,590	324,577	105,480
Exploration Costs	32,823	30,796	115,137	122,401
Dry Hole Costs	358	50	5,260	77
Impairments	44,617	53,677	160,934	325,798
Marketing Costs	1,326,974	793,536	3,853,827	2,320,671
Depreciation, Depletion and Amortization	918,180	846,222	2,515,445	2,527,642
General and Administrative	111,284	111,717	310,065	317,462
Taxes Other Than Income	209,043	125,912	582,395	386,319
Total	3,274,937	2,430,008	9,354,657	7,417,391
Operating Income	1,506,687	214,836	3,346,206	450,490
Other Income (Expense), Net	3,308	226	(4,516)	8,349
Income Before Interest Expense and Income Taxes	1,509,995	215,062	3,341,690	458,839
Interest Expense
Interest Expense, Net	63,632	69,082	189,032	211,010
Income Before Income Taxes	1,446,363	145,980	3,152,658	247,829
Income Tax Provision	255,411	45,439	626,386	95,718
Net Income	$ 1,190,952	$ 100,541	$ 2,526,272	$ 152,111
Net Income Per Share
Basic	$ 2.06	$ 0.17	$ 4.38	$ 0.26
Diluted	2.05	0.17	4.35	0.26
Dividends Declared per Common Share	$ 0.2200	$ 0.1675	$ 0.5900	$ 0.5025
Average Number of Common Shares
Basic	577,254	574,783	576,431	574,370
Diluted	581,559	578,736	580,442	578,453
Other Comprehensive Income (Loss)
Foreign Currency Translation Adjustments	$ (1,952)	$ 355	$ (179)	$ 1,924
Other, Net of Tax	6	(25)	18	(74)
Other Comprehensive Income (Loss)	(1,946)	330	(161)	1,850
Comprehensive Income	1,189,006	100,871	2,526,111	153,961
Crude Oil and Condensate
Operating Revenues and Other
Revenues	2,655,278	1,451,410	7,134,114	4,326,925
Natural Gas Liquids
Operating Revenues and Other
Revenues	353,704	180,038	861,473	480,389
Natural Gas
Operating Revenues and Other
Revenues	311,713	220,402	912,324	675,012
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts
Operating Revenues and Other
Revenues	(52,081)	(6,606)	(297,735)	64,860
Gathering, Processing and Marketing
Operating Revenues and Other
Revenues	1,360,992	784,368	3,899,250	2,289,702
Gains (Losses) on Asset Dispositions, Net
Operating Revenues and Other
Revenues	115,944	(8,202)	94,658	(33,876)
Other, Net
Operating Revenues and Other
Revenues	$ 36,074	$ 23,434	$ 96,779	$ 64,869