Segment Information (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue from External Customer [Line Items]
Revenue, Net	$ 14,501	$ 15,692	$ 14,669
Liquid hydrocarbons [Member]
Revenue from External Customer [Line Items]
Revenue, Net	11,932	12,983	11,778
Natural gas [Member]
Revenue from External Customer [Line Items]
Revenue, Net	937	1,052	1,203
Synthetic crude oil [Member]
Revenue from External Customer [Line Items]
Revenue, Net	1,542	1,409	1,442
Miscellaneous other [Member]
Revenue from External Customer [Line Items]
Revenue, Net	$ 90	$ 248	$ 246