Other Property and Equipment Other Property and Equipment - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) Compressor
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment	$ 12	$ (4)	$ 199
Property and equipment held for sale, net	29	95
Natural Gas Compressor [Member]
Property, Plant and Equipment [Line Items]
Equipment, Number of Units | Compressor			703
Proceeds from Sale of Property, Plant, and Equipment			$ 693
Gain (Loss) on Disposition of Property Plant Equipment	10	0	195
Buildings and land [Member]
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment	1	(3)	$ 2
Buildings and land [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Property, Plant and Equipment [Line Items]
Property and equipment held for sale, net	$ 29	$ 95