Consolidated Balance Sheets (unaudited) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current Assets
Cash and Cash Equivalents	$ 1,617	$ 1,455
Accounts Receivable, Net	686	783
Other Current Assets	422	180
Total Current Assets	2,725	2,418
Property, Plant and Equipment
Oil and Gas Properties (Successful Efforts Method of Accounting)	18,422	19,057
Property, Plant and Equipment, Other	335	294
Total Property, Plant and Equipment, Gross	18,757	19,351
Accumulated Depreciation, Depletion and Amortization	(5,882)	(6,569)
Total Property, Plant and Equipment, Net	12,875	12,782
Goodwill	635	696
Other Noncurrent Assets	625	548
Total Assets	16,860	16,444
Current Liabilities
Accounts Payable - Trade	1,243	1,343
Other Current Liabilities	1,014	925
Total Current Liabilities	2,257	2,268
Long-Term Debt	3,747	4,100
Deferred Income Taxes, Noncurrent	2,157	2,059
Other Noncurrent Liabilities	691	752
Total Liabilities	8,852	9,179
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 $0.01 and $3.33 1/3 per share; 500 Million and 250 Million Shares Authorized; 198 Million and 197 Million Shares Issued, Respectively	2	656
Additional Paid in Capital	3,244	2,497
Accumulated Other Comprehensive Loss	(94)	(100)
Treasury Stock, at Cost; 19 Million Shares	(651)	(638)
Retained Earnings	5,507	4,850
Total Shareholders' Equity	8,008	7,265
Total Liabilities and Shareholders' Equity	$ 16,860	$ 16,444