TAXES ON INCOME Income Taxes - Effective Rate Reconciliation (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
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Computed statutory income tax expense at 35%	$ 17	$ 50	$ (165)
Earnings from unconsolidated investments related to anticipated receipt of dividends	5	0	0
Non-deductible executive compensation	18	0	0
Premium on debt retirement	0	(10)	0
State income taxes, net of federal income tax benefit	1	4	21
Other	(2)	(3)	1
Total income tax expense	39	146	98
Predecessor
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Computed statutory income tax expense at 35%				16
Earnings from unconsolidated investments related to anticipated receipt of dividends				(5)
Non-deductible executive compensation				0
Premium on debt retirement				0
State income taxes, net of federal income tax benefit				1
Other				0
Total income tax expense				12
Trunkline LNG Transaction [Member] | Successor
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Other	0	105	0
Trunkline LNG Transaction [Member] | Predecessor
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Other				0
Trunkline LNG [Member] | Successor
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Non-deductible goodwill impairment	0	0	241
Trunkline LNG [Member] | Predecessor
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Non-deductible goodwill impairment				$ 0