Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Components of Deferred Tax Assets and Liabilities [Abstract]
Valuation Allowance, Amount	$ (584,000,000)	$ (457,000,000)	$ (11,000,000)	$ (6,000,000)
Deferred tax asset:
Net operating loss carryforwards	335,000,000	213,000,000
Alternative minimum tax credit	99,000,000	103,000,000
Stock compensation	25,000,000	24,000,000
Marketable securities	3,000,000	4,000,000
Oil and gas properties	59,000,000	49,000,000
Valuation Allowance	(584,000,000)	(457,000,000)	(11,000,000)	(6,000,000)
Foreign tax credit	535,000,000	421,000,000
Other	6,000,000	18,000,000
Deferred tax asset	491,000,000	375,000,000
Commodity derivatives	13,000,000	0
Deferred tax liability:
Commodity derivatives	0	(44,000,000)
Oil and gas properties	(1,592,000,000)	(1,283,000,000)
Deferred tax liability	(1,592,000,000)	(1,327,000,000)
Deferred Tax Assets (Liabilities), Net, Total	(1,101,000,000)	(952,000,000)
Less net current deferred tax liability	22,000,000	0
Deferred Tax Liabilities, Net, Current	0	(42,000,000)
Deferred Tax Assets (Liabilities), Net, Noncurrent	(1,123,000,000)	(910,000,000)
Deferred Tax Assets, Gross	1,075,000,000	832,000,000
Income tax reconciliation to US federal statutory rate
Amount computed using the statutory rate	60,000,000	(495,000,000)	217,000,000
Increase (decrease) in taxes resulting from:
State and local income taxes, net of federal effect	8,000,000	(18,000,000)	10,000,000
Valuation allowance, state net of federal	(2,000,000)	0	5,000,000
Other	(4,000,000)	2,000,000	(14,000,000)
Total income tax provision (benefit)	62,000,000	(511,000,000)	218,000,000
Income Taxes (Textuals) [Abstract]
Federal statutory tax rate	35.00%
Net operating loss carryforwards subject to annual limitations	189,000,000
International Nols That We Do Not Anticipate Utilizing		17,000,000
US state NOLs that we do not anticipate utilizing	74,000,000
State and Local Jurisdiction [Member]
Components of Deferred Tax Assets and Liabilities [Abstract]
Operating Loss Carryforwards	1,700,000,000	1,600,000,000
Federal [Member]
Components of Deferred Tax Assets and Liabilities [Abstract]
Operating Loss Carryforwards	1,000,000,000	500,000,000
Valuation Allowance, Tax Credit Carryforward [Member] | Foreign [Member]
Income Tax Contingency [Line Items]
Valuation Allowance, Deferred Tax Asset, Change in Amount	114,000,000	421,000,000	0
Valuation Allowance, Tax Credit Carryforward [Member] | Malaysia [Member]
Income Tax Contingency [Line Items]
Valuation Allowance, Deferred Tax Asset, Change in Amount	15,000,000	25,000,000	0
Valuation Allowance, Operating Loss Carryforwards [Member] | U.S. [Member]
Income Tax Contingency [Line Items]
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ (2,000,000)	$ 0	$ 5,000,000