Consolidated Balance Sheets (unaudited) (USD $) In Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Current Assets
Cash and Cash Equivalents	$ 1,527	$ 1,081
Accounts Receivable, Net	571	556
Other Current Assets	215	201
Total Assets, Current	2,313	1,838
Property, Plant and Equipment
Oil and Gas Properties (Successful Efforts Method of Accounting)	15,341	14,393
Property, Plant and Equipment, Other	278	263
Total Property, Plant and Equipment, Gross	15,619	14,656
Accumulated Depreciation, Depletion and Amortization	(4,751)	(4,392)
Total Property, Plant and Equipment, Net	10,868	10,264
Goodwill	696	696
Other Noncurrent Assets	462	484
Total Assets	14,339	13,282
Current Liabilities
Accounts Payable - Trade	1,072	927
Other Current Liabilities	430	495
Total Liabilities, Current	1,502	1,422
Long-Term Debt	2,797	2,272
Deferred Income Taxes, Noncurrent	2,188	2,110
Other Noncurrent Liabilities	694	630
Total Liabilities	7,181	6,434
Commitments and Contingencies
Shareholders' Equity
Preferred Stock - Par Value $1.00 per share; 4 Million Shares Authorized, None Issued	0	0
Common Stock - Par Value $3.33 1/3 per share; 250 Million Shares Authorized; 196 Million and 195 Million Shares Issued, Respectively	654	651
Additional Paid in Capital	2,446	2,385
Accumulated Other Comprehensive Loss	(86)	(104)
Treasury Stock, at Cost; 19 Million Shares	(640)	(624)
Retained Earnings	4,784	4,540
Total Shareholders' Equity	7,158	6,848
Total Liabilities and Shareholders' Equity	$ 14,339	$ 13,282