CONSOLIDATED STATEMENTS OF CASH FLOWS (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
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)		$ (3)	$ (535)
Reconciliation of net income to net cash provided by operating activities:
Net gain on curtailment of OPEB plans	(15)
CASH FLOWS FROM FINANCING ACTIVITIES:
CASH AND CASH EQUIVALENTS, beginning of period		17
CASH AND CASH EQUIVALENTS, end of period		32	17
Successor
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	39	(3)	(535)
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization	179	130	189
Goodwill Impairment	0	0	689
Deferred income taxes	90	(139)	181
Provision for bad debts	3	0	7
Amortization included in interest expense	(25)	(22)	(30)
Unrealized (gain) loss on derivatives	12	(25)	(52)
Non-cash compensation expense	0	5	6
Equity in (earnings) losses of unconsolidated affiliates	7	12	(15)
Distributions from unconsolidated affiliates	1	6	15
Net gain on curtailment of OPEB plans	(15)	0	0
Other non-cash	12	1	20
Changes in operating assets and liabilities, net of merger impacts	(178)	192	(159)
Net cash flows provided by operating activities	152	157	316
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from SUGS Contribution	0	0	482
Proceeds from sale of MGE assets, net of transaction costs	0	0	1,008
Proceeds from Citrus Merger	0	0	0
Proceeds from affiliates	0	20	0
Capital expenditures	(238)	(109)	(250)
Distributions from unconsolidated affiliates in excess of cumulative earnings	6	65	39
Other	(1)	(16)	5
Net cash flows (used in) provided by investing activities	(233)	(40)	1,284
CASH FLOWS FROM FINANCING ACTIVITIES:
Distributions to partners	(65)	(102)	(313)
Capital contribution from ETE	166	0	0
Issuance of loans from affiliates	55	0	1,669
Repayments of loans from affiliates	(55)	0	(975)
Issuance of long-term debt	0	0	0
Repayment of long-term debt	0	0	(1,795)
Net change in revolving credit facilities	(2)	0	(210)
Purchase of treasury stock	0	0	0
Other	(6)	0	(8)
Net cash flows (used in) provided by financing activities	93	(102)	(1,632)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	12	15	(32)
CASH AND CASH EQUIVALENTS, beginning of period	37	17	49
CASH AND CASH EQUIVALENTS, end of period	49	32	17
Predecessor
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)				50
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization				49
Goodwill Impairment				0
Deferred income taxes				23
Provision for bad debts				1
Amortization included in interest expense				1
Unrealized (gain) loss on derivatives				0
Non-cash compensation expense				2
Equity in (earnings) losses of unconsolidated affiliates				(16)
Distributions from unconsolidated affiliates				0
Net gain on curtailment of OPEB plans				0
Other non-cash				0
Changes in operating assets and liabilities, net of merger impacts				79
Net cash flows provided by operating activities				197
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from SUGS Contribution				0
Proceeds from sale of MGE assets, net of transaction costs				0
Proceeds from Citrus Merger				1,895
Proceeds from affiliates				37
Capital expenditures				(60)
Distributions from unconsolidated affiliates in excess of cumulative earnings				0
Other				(2)
Net cash flows (used in) provided by investing activities				1,870
CASH FLOWS FROM FINANCING ACTIVITIES:
Distributions to partners				(19)
Capital contribution from ETE				0
Issuance of loans from affiliates				0
Repayments of loans from affiliates				0
Issuance of long-term debt				455
Repayment of long-term debt				(1,048)
Net change in revolving credit facilities				12
Purchase of treasury stock				(1,450)
Other				(4)
Net cash flows (used in) provided by financing activities				(2,054)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS				13
CASH AND CASH EQUIVALENTS, beginning of period				24
CASH AND CASH EQUIVALENTS, end of period				37
Discontinued Operations [Member] | Successor
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization	206
Discontinued Operations [Member] | Predecessor
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization				$ 57