Condensed Consolidated Statements Of Operations Statements of Operations (Paranthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Paranthetical [Abstract]
Gas sales, related party amounts	$ 26	$ 9	$ 34	$ 15
NGL sales, related party amounts	11	1	12	26
Gathering, transportation and other fees, related party amounts	6	7	14	14
Other revenues, related party amounts	0	0	0	1
Cost of sales, related party amounts	23	8	27	16
Operating and Maintenance, related party amounts	0	3	0	18
General and administrative, related party amounts	$ 3	$ 4	$ 7	$ 9