CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Revenues
Sales and other operating revenues	$ 27,689,332		$ 20,225,764	[1]	$ 16,800,972	[1]
Gain on sale of assets	22,679		884	[1]	3,709	[1]
Interest and other income (loss)	33,538		(56,930)	[1]	90,502	[1]
Total revenues	27,745,549		20,169,718	[1]	16,895,206	[1]
Costs and Expenses
Crude oil and product purchases	21,875,297		15,351,318	[1]	12,821,305	[1]
Operating expenses	1,993,346		1,678,515	[1]	1,350,658	[1]
Exploration expenses, including undeveloped lease amortization	489,862		292,264	[1]	265,172	[1]
Selling and general expenses	301,005		259,215	[1]	212,376	[1]
Depreciation, depletion and amortization	1,093,406		1,114,529	[1]	870,999	[1]
Impairment of properties	368,600		0	[1]	5,240	[1]
Accretion of asset retirement obligations	37,701		31,857	[1]	26,154	[1]
Redetermination of Terra Nova working interest	(5,351)	[2]	18,582	[1],[2]	83,498	[1],[2]
Interest expense	55,831		53,172	[1]	53,005	[1]
Interest capitalized	(15,131)		(18,444)	[1]	(28,614)	[1]
Total costs and expenses	26,194,566		18,781,008	[1]	15,659,793	[1]
Income from continuing operations before income taxes	1,550,983		1,388,710	[1]	1,235,413	[1]
Income tax expense	810,051		609,151	[1]	521,559	[1]
Income from continuing operations	740,932		779,559	[1]	713,854	[1]
Income from discontinued operations, net of income taxes	131,770		18,522	[1]	123,767	[1]
Net Income	$ 872,702		$ 798,081	[1]	$ 837,621	[1]
Income per Common Share - Basic
Income from continuing operations	$ 3.83		$ 4.06	[1]	$ 3.74	[1]
Income from discontinued operations	$ 0.68		$ 0.10	[1]	$ 0.65	[1]
Net Income - Basic	$ 4.51		$ 4.16	[1]	$ 4.39	[1]
Income per Common Share - Diluted
Income from continuing operations	$ 3.81		$ 4.03	[1]	$ 3.71	[1]
Income from discontinued operations	$ 0.68		$ 0.10	[1]	$ 0.64	[1]
Net Income - Diluted	$ 4.49		$ 4.13	[1]	$ 4.35	[1]
Average Common shares outstanding - basic	193,409,621		191,830,357	[1]	190,767,077	[1]
Average Common shares outstanding - diluted	194,512,402		193,157,814	[1]	192,468,450	[1]

[1] Reclassified to conform to current presentation.

[2] Results exclude corporate overhead, interest and discontinued operations.