Basis of Presentation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011		Dec. 31, 2011
Other Revenues [Abstract]
Other Revenues	$ 0	[1]	$ 11	[1]	$ 0	[1]	$ 33	[1]
Production Expense
Lease Operating Expense	100		83		205		163
Production and Ad Valorem Taxes	44		39		81		70
Transportation and Gathering Expense	25		15		48		31
Total	169		137		334		264
Other Operating (Income) Expense, Net
Deepwater Gulf of Mexico Moratorium Expense	0	[2]	1	[2]	0	[2]	19	[2]
Electricity Generation Expense	0	[1]	9	[1]	0	[1]	26	[1]
Gain on Divestitures	(9)		(25)	[3]	(9)		(26)	[3]
Other, Net	7		4		19		(1)
Total	(2)		(11)		10		18
Other Non-Operating (Income) Expense, Net
Deferred Compensation (Income) Expense	(11)	[4]	(7)	[4]	(8)	[4]	3	[4]
Interest Income	0		(2)		0		(5)
Other (Income) Expense, Net	8		0		5		2
Total	(3)		(9)		(3)		0
Accounts Receivable, Net
Commodity Sales	319				319				356
Joint Interest Billings	394				394				313
Other	120				120				123
Allowance for Doubtful Accounts	(9)				(9)				(9)
Total	824				824				783
Other Current Assets
Inventories, Current	67				67				78
Commodity Derivative Assets	85				85				10
Deferred Income Taxes, Net	100	[5]			100	[5]			41	[5]
Probable Insurance Claims	31	[6]			31	[6]			15	[6]
Prepaid Expenses and Other Current Assets	85				85				36
Total	368				368				180
Other Noncurrent Assets
Equity Method Investments	373				373				329
Mutual Fund Investments	104				104				99
Commodity Derivative Assets	85				85				37
Other Assets, Noncurrent	80				80				83
Total	642				642				548
Other Current Liabilities
Production and Ad Valorem Taxes	119				119				121
Commodity Derivative Liabilities	2				2				76
Income Taxes Payable	107				107				127
Asset Retirement Obligations	45				45				33
Interest Payable	55				55				56
CONSOL Installment Payment	327	[7]			327	[7]			324	[7]
Current Portion of FPSO Lease Obligation	53				53				45
Liabilities Associated with Assets Held for Sale	234				234				0
Other	118				118				143
Total	1,060				1,060				925
Other Noncurrent Liabilities
Deferred Compensation Liabilities	224				224				222
Asset Retirement Obligations	298				298				344
Accrued Benefit Costs	89				89				88
Commodity Derivative Liabilities	0				0				7
Other	72				72				91
Total	$ 683				$ 683				$ 752
Common stock, shares authorized (in shares)	500,000,000				500,000,000				250,000,000
Common stock, par value per share (in dollars per share)	$ 0.01				$ 0.01				$ 3.333

[1] Other revenues consist of electricity sales from the Machala power plant, located in Machala, Ecuador, through May 2011. 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.

[3] Amount relates primarily to the transfer of our Ecuador assets to the Ecuadorian government. See Note 2. Basis of Presentation.

[4] Amounts represent increases (decreases) in the fair value of shares of our common stock held in a rabbi trust.

[5] 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.

[6] Amounts represent the costs incurred to date of the Leviathan-2 appraisal well and expected well abandonment costs in excess of the insurance deductible less insurance proceeds received to date. See Note 9. Asset Retirement Obligations.

[7] See Note 3. Acquisitions and Dispositions and Note 5. Debt.