Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current Assets
Cash and Cash Equivalents	$ 1,108,034	$ 876,435
Accounts Receivable, Net	1,891,202	1,656,618
Inventories	697,478	683,187
Assets from Price Risk Management Activities	32,711	166,135
Income Taxes Receivable	24,435	29,163
Deferred Income Taxes	102,035	0
Other	225,123	178,346
Total	4,081,018	3,589,884
Property, Plant and Equipment
Oil and Gas Properties (Successful Efforts Method)	39,075,040	38,126,298
Other Property, Plant and Equipment	2,769,601	2,740,619
Total Property, Plant and Equipment	41,844,641	40,866,917
Less: Accumulated Depreciation, Depletion and Amortization	(17,906,671)	(17,529,236)
Total Property, Plant and Equipment, Net	23,937,970	23,337,681
Other Assets	213,625	409,013
Total Assets	28,232,613	27,336,578
Current Liabilities
Accounts Payable	2,258,232	2,078,948
Accrued Taxes Payable	155,140	162,083
Dividends Payable	50,510	45,802
Liabilities from Price Risk Management Activities	14,108	7,617
Deferred Income Taxes	2,164	22,838
Current Portion of Long-Term Debt	406,579	406,579
Other	187,958	200,191
Total	3,074,691	2,924,058
Long-Term Debt	5,905,917	5,905,602
Other Liabilities	864,011	894,758
Deferred Income Taxes	4,631,685	4,327,396
Commitments and Contingencies (Note 8)
Stockholders' Equity
Common Stock, $0.01 Par, 640,000,000 Shares Authorized and 272,366,287 Shares Issued at March 31, 2013 and 271,958,495 Shares Issued at December 31, 2012	202,724	202,720
Additional Paid in Capital	2,539,578	2,500,340
Accumulated Other Comprehensive Income	427,832	439,895
Retained Earnings	10,619,426	10,175,631
Common Stock Held in Treasury, 308,010 Shares at March 31, 2013 and 326,264 Shares at December 31, 2012	33,251	33,822
Total Stockholders' Equity	13,756,309	13,284,764
Total Liabilities and Stockholders' Equity	$ 28,232,613	$ 27,336,578