RELATED PARTY TRANSACTIONS Related Party Distributions (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended		3 Months Ended
	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Mar. 25, 2012
Successor
Distributions from unconsolidated affiliates	$ 1	$ 6	$ 15
Successor | ETP [Member]
Distributions from unconsolidated affiliates	6	9	8
Successor | Regency [Member]
Distributions from unconsolidated affiliates	0	61	44
Predecessor
Distributions from unconsolidated affiliates				0
Predecessor | ETP [Member]
Distributions from unconsolidated affiliates				0
Predecessor | Regency [Member]
Distributions from unconsolidated affiliates				$ 0