Other Property and Equipment Other Property and Equipment Net Gains (Losses) on Sales of Fixed Assets Table (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Net gains on sales of fixed assets	$ (302)	$ (267)	$ (437)
Gas Gathering and Processing Equipment [Member]
Property, Plant and Equipment [Line Items]
Net gains on sales of fixed assets	(326)	(286)	(440)
Exploration and Production Equipment [Member]
Property, Plant and Equipment [Line Items]
Net gains on sales of fixed assets	2	10	1
Land and Building [Member]
Property, Plant and Equipment [Line Items]
Net gains on sales of fixed assets	27	7	2
Other Assets
Property, Plant and Equipment [Line Items]
Net gains on sales of fixed assets	$ (5)	$ 2	$ 0