Additional Financial Statement Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Other Revenues [Abstract]
Other Revenues	$ 0		$ 0		$ 32	[1]
Production Expense
Lease Operating Expense	530		431		346
Production and Ad Valorem Taxes	188		151		146
Transportation Expense	132		91		66
Total	850		673		558
Other Operating Expense, Net
Deepwater Gulf of Mexico Moratorium Expense	0		0		18	[2]
Electricity Generation Expense	0		0		26	[1]
Other, Net	43		25		42
Total	43		25		86
Other Non-Operating (Income) Expense, Net
Deferred Compensation Expense	26		6		8	[3]
Other (Income) Expense, Net	(5)		0		1
Total	21		6		9
Accounts Receivable, Net
Commodity Sales	495		349
Joint Interest Billings	382		486
Other	81		139
Allowance for Doubtful Accounts	(11)		(10)
Total	947		964
Other Current Assets
Inventories, Materials and Supplies	96		68
Inventories, Crude Oil	25		22
Commodity Derivative Assets, Current	1		63
Deferred Income Taxes, Net, Current	62		106
Assets Held for Sale	292	[4]	45	[4]
Prepaid Expenses and Other Assets, Current	71		116
Total	547		420
Other Noncurrent Assets
Equity Method Investments	437		367		329
Mutual Fund Investments	114		103
Commodity Derivative Assets, Noncurrent	16		21
Other Assets, Noncurrent	112		106
Total	679		597
Other Current Liabilities
Production and Ad Valorem Taxes	103		113
Commodity Derivative Liabilities, Current	65		7
Income Taxes Payable	156		203
Asset Retirement Obligations, Current	39		69
Interest Payable	63		55
Current Portion of Long Term Debt	200	[5]	324	[5]
Current Portion of Capital Lease and Other Obligations	58		48
Liabilities Associated with Assets Held for Sale	111	[4]	12	[4]
Other Liabilities, Current	193		193
Total	988		1,024
Other Noncurrent Liabilities
Deferred Compensation Liabilities, Noncurrent	253		229
Asset Retirement Obligations, Noncurrent	547		333
Noncurrent Liabilities	155	[6]	116	[6]
Other Liabilities, Noncurrent	154		132
Total	$ 1,109		$ 810

[1] Other revenues consist primarily 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] Amounts relate to rig stand-by expense incurred due to the deepwater Gulf of Mexico drilling moratorium.

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

[4] Assets held for sale consist primarily of oil and gas properties and liabilities associated with asset retirement obligations located in China, the North Sea and onshore US at December 31, 2013 and the North Sea at December 31, 2012. See Note 3. Property Transactions.

[5] See Note 10. Long-Term Debt.

[6] Amount includes liabilities accrued under our defined benefit pension plan, restoration plan, and other postretirement benefit plans. See Note 12. Stock-Based and Other Compensation Plans.