Basis of Presentation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011		Dec. 31, 2011
Other Revenues [Abstract]
Other Revenues	$ 0	[1]	$ 21	[1]
Production Expense
Lease Operating Expense	118		92
Production and Ad Valorem Taxes	38		32
Transportation and Gathering Expense	23		18
Total	179		142
Other Operating (Income) Expense, Net
Deepwater Gulf of Mexico Moratorium Expense	0	[2]	18	[2]
Electricity Generation Expense	0	[1]	17	[1]
Other, Net	12		1
Total	12		36
Other Non-Operating (Income) Expense, Net
Deferred Compensation Expense	3	[3]	10	[3]
Interest Income	0		(3)
Other (Income) Expense, Net	(4)		1
Total	(1)		8
Accounts Receivable, Net
Commodity Sales	467				356
Joint Interest Billings	344				313
Other	117				123
Allowance for Doubtful Accounts	(9)				(9)
Total	919				783
Other Current Assets
Inventories, Current	77				78
Commodity Derivative Assets, Current	17				10
Deferred Income Taxes, Net, Current	159	[4]			41	[4]
Probable Insurance Claims	22	[5]			15	[5]
Prepaid Expenses and Other Assets, Current	55				36
Total	330				180
Other Noncurrent Assets
Equity Method Investments	376				329
Mutual Fund Investments	108				99
Commodity Derivative Assets, Noncurrent	22				37
Other Assets, Noncurrent	86				83
Total	592				548
Other Current Liabilities
Production and Ad Valorem Taxes	123				121
Commodity Derivative Liabilities, Current	119				76
Income Taxes Payable	131				127
Asset Retirement Obligations, Current	41				33
Interest Payable	41				56
CONSOL Installment Payment	325	[6]			324	[6]
Current Portion of FPSO Lease Obligation	48				45
Other	123				143
Total	951				925
Other Noncurrent Liabilities
Deferred Compensation Liabilities, Noncurrent	237				222
Asset Retirement Obligations, Noncurrent	350				344
Accrued Benefit Costs, Noncurrent	90				88
Commodity Derivative Liabilities, Noncurrent	29				7
Other	113				91
Total	$ 819				$ 752
Common stock, shares authorized (in shares)	250,000,000				250,000,000
Common stock, shares authorized after April 24th, 2012 (in shares)	500,000,000
Common stock, par value per share (in dollars per share)	$ 3.333				$ 3.333
Common stock, par value per share after April 24th, 2012 (in dollars per share)	$ 0.01

[1] Other revenues for first quarter 2011 consist of electricity sales from the Machala power plant located in Machala, Ecuador. Electricity generation expense includes all operating and non-operating expenses associated with the plant, including depreciation and changes in the allowance for doubtful accounts. In May 2011, we transferred our assets in Ecuador to the Ecuadorian government.

[2] Amount relates to rig stand-by expense incurred prior to receiving a permit to resume drilling activities in the deepwater Gulf of Mexico in 2011.

[3] Amounts represent increases in the fair value of shares of our common stock held in a rabbi trust.

[4] Increase from December 31, 2011 is due to reclassification of deferred income tax assets from long-term to short-term as certain foreign entities are estimated to begin utilizing net operating loss carryforwards in 2012 and 2013.

[5] Amounts represent the costs incurred to date of the Leviathan-2 well in excess of the insurance deductible and insurance proceeds received to date.

[6] See Note 3. Acquisitions and Note 4. Debt.