Other Property and Equipment Other Property and Equipment Net Gains (Losses) on Sales of Fixed Assets Table (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Property, Plant and Equipment [Line Items]
Net gains on sales of fixed assets	$ (86)	$ (132)	$ (201)	$ (290)
Natural Gas Compressors [Member]
Property, Plant and Equipment [Line Items]
Net gains on sales of fixed assets	(75)	0	(195)	0
Gathering and Processing Equipment [Member]
Property, Plant and Equipment [Line Items]
Net gains on sales of fixed assets	(5)	(132)	8	(311)
Exploration and Production Equipment [Member]
Property, Plant and Equipment [Line Items]
Net gains on sales of fixed assets	0	0	(7)	1
Land and Building [Member]
Property, Plant and Equipment [Line Items]
Net gains on sales of fixed assets	(6)	1	(5)	24
Other Assets [Member]
Property, Plant and Equipment [Line Items]
Net gains on sales of fixed assets	$ 0	$ (1)	$ (2)	$ (4)