Dispositions (Details) (USD $)	12 Months Ended			1 Months Ended			1 Months Ended				7 Months Ended	12 Months Ended						3 Months Ended	1 Months Ended		12 Months Ended	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2013 DJ Basin [Member]	Apr. 30, 2011 DJ Basin [Member] acre	Feb. 28, 2013 Marcellus Shale [Member]	Feb. 28, 2013 Neptune Gas Plant [Member]	Jan. 31, 2013 Alaska EP [Member]	Dec. 31, 2012 Alaska Assets And Neptune Gas Plant [Member]	Dec. 31, 2013 Safen Block [Member]	Dec. 31, 2013 Angola Assets [Member]	Dec. 31, 2013 Angola Assets [Member]	Dec. 31, 2012 Angola Assets [Member]	Dec. 31, 2011 Angola Assets [Member]	Dec. 31, 2013 Angola Blk 31 [Member]	Jun. 30, 2013 Angola Blk 31 [Member]	Dec. 31, 2013 Angola Blk 32 [Member]	Sep. 30, 2012 Eagle Ford Shale Member [Member] acre	Jan. 31, 2012 GOM Pipelines [Member]	May 31, 2012 INDONESIA	Dec. 31, 2011 Burnspoint [Member]	Sep. 30, 2011 Alaska LNG [Member]
Dispositions Detail [Line Items]
Agreement of Sale of Oil and Gas Property and Equipment											$ 2,100,000,000
Gas and oil acreages undeveloped and developed net					180,000													5,800
Proceeds from Sale of Oil and Gas Property and Equipment	450,000,000	467,000,000	518,000,000	19,000,000	270,000,000		166,000,000	195,000,000										9,000,000	206,000,000		36,000,000	8,000,000
Proceeds from Sale of Oil and Gas Property and Equipment, Six Month Escrow								50,000,000
Pretax gain/loss on sale				114,000,000	(37,000,000)	43,000,000	(98,000,000)	(55,000,000)		17,000,000								18,000,000	(166,000,000)	36,000,000	(34,000,000)	(8,000,000)
Interest Percentage					30.00%					45.00%						10.00%	10.00%				50.00%
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Disposal Group, Including Discontinued Operation, Revenue												361,000,000
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax												247,000,000	(17,000,000)	(17,000,000)
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Assets of Disposal Group, Including Discontinued Operation, Current									50,000,000						41,000,000
Disposal Group, Including Discontinued Operation, Other Noncurrent Assets									248,000,000						1,647,000,000
Total assets									298,000,000						1,688,000,000
Liabilities of Disposal Group, Including Discontinued Operation, Current															25,000,000
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent									83,000,000						43,000,000
Total liabilities									$ 83,000,000						$ 68,000,000