Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Current Assets
Cash and Cash Equivalents	$ 615,726	$ 788,853
Accounts Receivable, Net	1,451,227	1,113,279
Inventories	590,594	415,792
Assets from Price Risk Management Activities	450,730	48,153
Income Taxes Receivable	26,609	54,916
Deferred Income Taxes	0	9,260
Other	119,052	97,193
Total	3,253,938	2,527,446
Property, Plant and Equipment
Oil and Gas Properties (Successful Efforts Method)	33,664,435	29,263,809
Other Property, Plant and Equipment	2,149,989	1,733,073
Total Property, Plant and Equipment	35,814,424	30,996,882
Less: Accumulated Depreciation, Depletion and Amortization	(14,525,600)	(12,315,982)
Total Property, Plant and Equipment, Net	21,288,824	18,680,900
Other Assets	296,035	415,887
Total Assets	24,838,797	21,624,233
Current Liabilities
Accounts Payable	2,033,615	1,664,944
Accrued Taxes Payable	147,105	82,168
Dividends Payable	42,578	38,962
Liabilities from Price Risk Management Activities	0	28,339
Deferred Income Taxes	135,989	41,703
Current Portion of Long-Term Debt	0	220,000
Other	163,032	143,983
Total	2,522,319	2,220,099
Long-Term Debt	5,009,166	5,003,341
Other Liabilities	799,189	667,455
Deferred Income Taxes	3,867,219	3,501,706
Commitments and Contingencies (Note 7)
Stockholders' Equity
Common Stock, $0.01 Par, 640,000,000 Shares Authorized and 269,323,084 Shares and 254,223,521 Shares Issued at December 31, 2011 and 2010, respectively	202,693	202,542
Additional Paid in Capital	2,272,052	729,992
Accumulated Other Comprehensive Income	401,746	440,071
Retained Earnings	9,789,345	8,870,179
Common Stock Held in Treasury, 303,633 Shares and 146,186 Shares at December 31, 2011 and 2010, respectively	(24,932)	(11,152)
Total Stockholders' Equity	12,640,904	10,231,632
Total Liabilities and Stockholders' Equity	$ 24,838,797	$ 21,624,233