CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Operating Activities
Net income	$ 872,702		$ 798,081	[1]	$ 837,621	[1]
Adjustments to reconcile net income to net cash provided by operating activities
Income from discontinued operations	(131,770)		(18,522)	[1]	(123,767)	[1]
Depreciation, depletion and amortization	1,093,406		1,114,529	[1]	870,999	[1]
Impairment of long-lived assets	368,600		0	[1]	5,240	[1]
Amortization of deferred major repair costs	23,076		15,561	[1]	7,348	[1]
Expenditures for asset retirements	(24,692)		(36,506)	[1]	(48,694)	[1]
Dry hole costs	250,954		90,125	[1]	125,244	[1]
Amortization of undeveloped leases	118,211		108,026	[1]	83,213	[1]
Accretion of asset retirement obligations	37,701		31,857	[1]	26,154	[1]
Deferred and noncurrent income tax charges	171,565		135,225	[1]	95,245	[1]
Pretax gains from disposition of assets	(22,679)		(884)	[1]	(3,709)	[1]
Net decrease (increase) in noncash operating working capital	(825,154)		639,566	[1]	(194,690)	[1]
Other operating activities - net	67,955		151,012	[1]	90,001	[1]
Net cash provided by continuing operations	1,999,875		3,028,070	[1]	1,770,205	[1]
Net cash provided by discontinued operations	145,510		100,488	[1]	94,428	[1]
Net cash provided by operating activities	2,145,385		3,128,558	[1]	1,864,633	[1]
Investing Activities
Property additions and dry hole costs	(2,623,407)		(2,199,049)	[1]	(1,866,114)	[1]
Acquisition of ethanol plants	0	[2]	(40,000)	[1],[2]	(10,000)	[1],[2]
Proceeds from sale of property, plant and equipment	27,776		2,189	[1]	1,616	[1]
Expenditures for major repairs	(5,409)		(61,387)	[1]	(19,252)	[1]
Purchase of investment securities	(1,689,087)	[3]	(2,388,720)	[1],[3]	(2,531,515)	[1],[3]
Proceeds from maturity of investment securities	1,773,552	[3]	2,551,187	[1],[3]	2,172,830	[1],[3]
Other investing activities - net	8,014		(38,157)	[1]	(34,050)	[1]
Investing activities of discontinued operations
Sales proceeds	950,010		0	[1]	78,908	[1]
Other	(55,803)		(154,875)	[1]	(124,330)	[1]
Net cash required by investing activities	(1,614,354)		(2,328,812)	[1]	(2,331,907)	[1]
Financing Activities
Additions to long-term debt	0		0	[1]	243,500	[1]
Reductions of long-term debt	(340,041)		(332,038)	[1]	0	[1]
Reductions of nonrecourse debt of a subsidiary	0		(82,000)	[1]	(2,572)	[1]
Proceeds from exercise of stock options and employee stock purchase plans	15,551		42,995	[1]	12,746	[1]
Excess tax benefits related to exercise of stock options	4,838		11,672	[1]	4,143	[1]
Withholding tax on stock-based incentive awards	(8,014)		(5,170)	[1]	0	[1]
Issue cost of debt facility	(7,905)		0	[1]	0	[1]
Cash dividends paid	(212,752)		(201,405)	[1]	(190,788)	[1]
Net cash provided (required) by financing activities	(548,323)		(565,946)	[1]	67,029	[1]
Effect of exchange rate changes on cash and cash equivalents	(4,660)		881	[1]	35,279	[1]
Net increase (decrease) in cash and cash equivalents	(21,952)		234,681	[1]	(364,966)	[1]
Cash and cash equivalents at January 1	535,825	[1]	301,144	[1]	666,110	[1]
Cash and cash equivalents at December 31	$ 513,873		$ 535,825	[1]	$ 301,144	[1]

[1] Reclassified to conform to current presentation.

[2] Excludes nonrecourse seller financing of $82 million related to the Company's acquisition of the Hankinson, North Dakota, ethanol plant in 2009.

[3] Investments are Canadian government securities with maturities greater than 90 days at the date of acquisition.