Other Property and Equipment - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($) Compressor	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($) Compressor	Dec. 31, 2014 USD ($)
Property, Plant and Equipment [Line Items]
Property and equipment held for sale, net	$ 93		$ 93		$ 93
Gain (Loss) on Disposition of Property Plant Equipment	(1)	$ 93	(4)	$ 115
Compressor [Member]
Property, Plant and Equipment [Line Items]
Equipment, Number of Units | Compressor		337		102
Proceeds from Sale of Property, Plant, and Equipment		$ 362		$ 159
Gain (Loss) on Disposition of Property Plant Equipment		93		24
Land and Building [Member]
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment	0	$ (1)	(1)	$ (1)
Land and Building [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Property, Plant and Equipment [Line Items]
Property and equipment held for sale, net	$ 93		$ 93		$ 93