CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012
OPERATING ACTIVITIES
Net income	$ 763,243		$ 585,508	[1]
Adjustments to reconcile net income to net cash provided by operating activities
Income from discontinued operations	(223,145)		(12,764)	[1]
Depreciation, depletion and amortization	806,042		642,410	[1]
Impairment of assets	21,587		0	[1]
Amortization of deferred major repair costs	12,991		10,949	[1]
Expenditures for asset retirements	(20,124)		(12,763)	[1]
Dry hole costs	81,305		34,217	[1]
Amortization of undeveloped leases	32,052		75,072	[1]
Accretion of asset retirement obligations	24,404		19,047	[1]
Deferred and noncurrent income tax charges	65,333		43,945	[1]
Pretax (gain) loss from disposition of assets	278		(125)	[1]
Net (increase) decrease in noncash operating working capital	65,144		(103,345)	[1]
Other operating activities, net	24,172		32,086	[1]
Net cash provided by continuing operations	1,653,282		1,314,237	[1]
Net cash provided by discontinued operations	15,728		32,881	[1]
Net cash provided by operating activities	1,669,010		1,347,118	[1]
INVESTING ACTIVITIES
Property additions and dry hole costs	(1,963,618)	[2]	(1,314,589)	[1],[2]
Proceeds from sales of assets	169		163	[1]
Purchase of investment securities	(373,196)	[3]	(836,472)	[1],[3]
Proceeds from maturity of investment securities	358,915	[3]	897,793	[1],[3]
Expenditures for major repairs	(7,682)		(7,440)	[1]
Investing activities of discontinued operations
Sales proceeds	282,202		0	[1]
Property additions and other	(8,109)		(22,430)	[1]
Other - net	4,379		5,872	[1]
Net cash required by investing activities	(1,706,940)		(1,277,103)	[1]
FINANCING ACTIVITIES
Borrowings of long-term debt	461,978	[2]	541,896	[1],[2]
Maturities of notes payable	0		(350,000)	[1]
Purchase of treasury stock	(250,000)		0	[1]
Proceeds from exercise of stock options and employee stock purchase plans	2,628		8,752	[1]
Excess tax benefits related to exercise of stock options	69		1,328	[1]
Withholding tax on stock-based incentive awards	(8,966)		(3,703)	[1]
Issue cost of notes payable and debt facility	(2,793)		(3,943)	[1]
Cash dividends paid	(119,376)		(106,797)	[1]
Net cash provided by financing activities	83,540		87,533	[1]
Effect of exchange rate changes on cash and cash equivalents	(18,500)		221	[1]
Net increase in cash and cash equivalents	27,110		157,769	[1]
Cash and cash equivalents, beginning	947,316		513,873	[1]
Cash and cash equivalents, ending	$ 974,426		$ 671,642	[1]

[1] Reclassified to conform to current presentation.

[2] 2 Excludes non-cash asset and long-term obligation of $356,170 in 2013 associated with lease commencement for production equipment at the Kakap field offshore Malaysia.

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