CONSOLIDATED STATEMENTS OF CASH FLOWS (Segment, Continuing Operations [Member], USD $) In Millions, unless otherwise specified	9 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2012 Successor [Member]	Mar. 25, 2012 Predecessor [Member]	Dec. 31, 2011 Predecessor [Member]	Dec. 31, 2010 Predecessor [Member]
Cash flows from operating activities:
Net income (loss)	$ 39	$ 50	$ 255	$ 225
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	206	57	238	229
Increase (Decrease) in Deferred Income Taxes	90	23	104	107
Provision for bad debts	3	1	8	9
Amortization of costs charged to interest	(25)	1	0	0
Net gain on curtailment of OPEB plans	(15)	0	0	0
Unrealized loss on derivatives	12	0	0	19
Gain (Loss) on asset sales or dispositions	0	0	2	2
Share-based compensation expense	0	2	10	9
Earnings from unconsolidated investments, net of cash distributions	7	(16)	(96)	(102)
Changes in operating assets and liabilities, net of Merger impact	(165)	79	10	(73)
Net cash flows provided by (used in) operating activities	152	197	531	425
Cash flows from investing activities:
Additions to property, plant and equipment	(238)	(60)	(290)	(293)
Payments to Acquire Equity Method Investments	0	0	0	(100)
Loan to unconsolidated investments	0	0	(72)	0
Loan repayment from unconsolidated investments	0	37	35	0
Distributions In Excess Of Earnings Of Affiliates	6	0	0	0
Proceeds from Citrus Merger	0	1,895	0	0
Plant retirements and other	(1)	(2)	(1)	1
Net cash flows provided by (used in) investing activities	(233)	1,870	(328)	(392)
Cash flows from financing activities:
Issuance of long-term debt	0	455	0	101
Captial contribution from ETE	166	0	0	0
Dividends paid on common stock	(65)	(19)	(74)	(75)
Note payable - related party	55	0	0	0
Payments on note payable - related party	(55)	0	0	0
Dividends paid on preferred stock	0	0	0	(7)
Extinguishment of preferred stock	0	0	0	(115)
Repayment of long-term debt	0	(1,048)	(19)	(141)
Net change in revolving credit facilities	(2)	12	(97)	217
Purchase of treasury stock	0	(1,453)	0	0
Other	(6)	(1)	8	(21)
Net cash flows provided by (used in) financing activities	93	(2,054)	(182)	(41)
Change in cash and cash equivalents	12	13	21	(8)
Cash and cash equivalents at beginning of period	37	24	3	11
Cash and cash equivalents at end of period	$ 49	$ 37	$ 24	$ 3