Other Property and Equipment - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($) Compressor	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($) Compressor	Dec. 31, 2014 USD ($)
Property, Plant and Equipment [Line Items]
Net (gains) losses on sales of fixed assets	$ (1)	$ (86)	$ 3	$ (201)
Property and equipment held for sale, net	94		94		$ 93
Hilcorp Energy [Member]
Property, Plant and Equipment [Line Items]
Equipment, Number of Units | Compressor		61
Exterran Partners L.P. [Member]
Property, Plant and Equipment [Line Items]
Proceeds from Sale of Property, Plant, and Equipment		$ 133
Compressor [Member] | Hilcorp Energy [Member]
Property, Plant and Equipment [Line Items]
Equipment, Number of Units | Compressor		61
Proceeds from Sale of Property, Plant, and Equipment		$ 19
Net (gains) losses on sales of fixed assets		$ (6)
Compressor [Member] | Exterran Partners L.P. [Member]
Property, Plant and Equipment [Line Items]
Equipment, Number of Units | Compressor		162		499
Proceeds from Sale of Property, Plant, and Equipment				$ 495
Net (gains) losses on sales of fixed assets		$ (68)		$ (161)
Compressor [Member] | Access Midstream Partners, L.P. [Member]
Property, Plant and Equipment [Line Items]
Equipment, Number of Units | Compressor				102
Proceeds from Sale of Property, Plant, and Equipment				$ 159
Net (gains) losses on sales of fixed assets				(24)
Land and Building [Member]
Property, Plant and Equipment [Line Items]
Net (gains) losses on sales of fixed assets	(1)	$ (6)	0	$ (5)
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	$ 94		$ 94		$ 93