Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended	9 Months Ended		12 Months Ended		9 Months Ended		12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended		12 Months Ended		3 Months Ended	12 Months Ended
	Dec. 31, 2012 Successor	Dec. 31, 2013 Successor	Dec. 31, 2012 Successor Southern Union		Dec. 31, 2013 Successor Southern Union		Dec. 31, 2012 Successor Affiliated Entity		Dec. 31, 2013 Successor Affiliated Entity	Mar. 25, 2012 Predecessor	Dec. 31, 2011 Predecessor	Mar. 25, 2012 Predecessor Southern Union		Dec. 31, 2011 Predecessor Southern Union		Mar. 25, 2012 Predecessor Affiliated Entity	Dec. 31, 2011 Predecessor Affiliated Entity
Operation and maintenance:
Transportation and storage of natural gas			$ 7	[1]	$ 31	[1]						$ 1	[1]	$ 3	[1]
Operating, maintenance and general							61	[2]	59							14	58
Other income, net:
Interest income	$ 2	$ 2	$ 2		$ 2					$ 2	$ 9	$ 2		$ 9

[1] (1) Represents transportation and storage revenues with ETC and Sunoco, subsidiaries of ETP (in the successor periods) and MGE, a division of Southern Union that was sold in the third quarter of 2013.

[2] (2) Primarily represents corporate charges for employee expenses related to the ETE Merger offset by expenses attributable to services provided by Panhandle on behalf of other affiliate companies.