Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014 MBbls	Sep. 30, 2013	Sep. 30, 2014 MBbls	Sep. 30, 2013	Dec. 31, 2013 MBbls
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration	$ 898		$ 898
Gain on Sale of Malaysia, before Income Tax	0	0	388	0
Gain on Sale of Malaysia, Net of Tax			249
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	2	(61)	(29)	(158)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	1	(31)	(260)	(53)
Discontinued Operation, Tax Effect of Discontinued Operation	(1)	29	157	103
Historical Effective Tax Rate, Discontinuing Operations			37.00%
Effective Income Tax Rate, Discontinuing Operations	63.10%	48.20%	37.80%	65.70%
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative	1,438		1,438		1,300
Less — accumulated depreciation, depletion and amortization	(7,915)		(7,915)		(8,306)
Disposal Group, Including Discontinued Operation, Revenue	0	189	112	659
Disposal Group, Including Discontinued Operation, Operating Expense	2	128	83	501
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	2	(61)	(29)	(158)
Disposal Group, Including Discontinued Operation, Other Expense	0	1	0	2
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	0	0	388	0
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	(2)	60	417	156
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	1	(31)	(260)	(53)
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents	27		27		84
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	89		89		200
Disposal Group, Including Discontinued Operation, Inventory	14		14		130
Disposal Group, Including Discontinued Operation, Other Current Assets	5		5		33
Assets of Disposal Group, Including Discontinued Operation, Current	135		135		447
Disposal Group, including Discontinued Operations, Oil and Gas Properties, Net	540		540		989
Disposal Group, Including Discontinued Operation, Deferred Tax Assets	0		0		19
Disposal Group, Including Discontinued Operation, Other Noncurrent Assets	1		1		4
Assets of Disposal Group, Including Discontinued Operation, Noncurrent	541		541		1,012
Assets of Disposal Group, Including Discontinued Operation	676		676		1,459
Disposal Group, Including Discontinued Operation, Accounts Payable	3		3		38
Disposal Group, Including Discontinued Operation, Accrued Liabilities	202		202		324
Disposal Group, Including Discontinued Operations, Asset Retirement Obligation, Current	0		0		49
Disposal Group, Including Discontinued Operation, Other Current Liabilities	0		0		18
Liabilities of Disposal Group, Including Discontinued Operation, Current	205		205		429
Disposal Group, Including Discontinued Operations, Asset Retirement Obligations	2		2		86
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities	104		104		129
Disposal Group, Including Discontinued Operation, Other Noncurrent Liabilities	0		0		11
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	106		106		226
Liabilities of Disposal Group, Including Discontinued Operation	311		311		655
Crude oil inventory in barrels	75		75		1,100
Energy Related Inventory, Petroleum	3		3		90
CHINA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	2	(9)	(8)	(26)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	1	(8)	(2)	(13)
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	2	(9)	(8)	(26)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	1	(8)	(2)	(13)
MALAYSIA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative					115
Asset Retirement Obligation, Period Increase (Decrease)			133
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Less — accumulated depreciation, depletion and amortization	(118)		(118)		(1,121)
Current [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Tax Effect of Discontinued Operation	(1)	10	13	65
Deferred [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Tax Effect of Discontinued Operation	$ 0	$ 19	$ 144	$ 38