Supplementary Oil and Gas Disclosure (Unaudited) - (Textuals) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 MMBTU MBbls	Dec. 31, 2012 MBbls	Dec. 31, 2011 MBbls
Costs Incurred, Asset Retirement Obligation Incurred	121	$ 9	$ 33
Years experience employee overseeing reserve estimation is greater than	30 years 0 months 0 days
Years reserve estimation experience	20 years 0 months 0 days
Proved Reserves Extensions, Discoveries, Additions and Purchase of Minerals in Place	82,000	86,000	151,000
Percentage of Liquids Comprising Proved Reserves	55.00%	48.00%	40.00%
Percentage of drillling additions related out major, domestic resource plays	98.00%
Proved Undeveloped Reserves Additions	54
Proved developed liquids additions	17
Proved Reserve Revisions Percentage of Beginning Reserves	2.00%
Proved Reserves Price Related Revisions	10
Proved Reserve Revisions Development	75
Proved Undeveloped Reserves Reclassified To Probable Reserves	294,000,000
Proved Undeveloped Reserves Development Horizon	5 years 0 months 0 days
Proved Reserves Performance Related Revisions	14
Net effect of proved reserve revisions, additions and purchases	96
Domestic [Member]
Costs of Non Exploitation Activities For Exploration	250	239	237
Malaysia [Member]
Costs of Non Exploitation Activities For Exploration	75	63	9
China [Member]
Costs of Non Exploitation Activities For Exploration	$ 33	$ 1	$ 25