Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Carrying value of noncurrent obligations (due more than one year or one operating cycle, whichever is longer) relating to the sale, disposal or planned sale in the near future (generally within one year) of a disposal group, including a component of the entity (discontinued operation), as of the balance sheet date.

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CONTRIBUTION AND DISPOSALS CONTRIBUTION AND DISPOSALS - Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Mar. 25, 2012 Predecessor [Member]	Sep. 30, 2013 Successor [Member]	Sep. 30, 2012 Successor [Member]	Sep. 30, 2012 Successor [Member]	Sep. 30, 2013 Successor [Member]	Sep. 30, 2013 New England Gas Company [Member]	Sep. 30, 2013 Missouri Gas Energy [Member]	Sep. 30, 2013 New England Gas Company [Member]
Business Acquisition, Cost of Acquired Entity, Purchase Price									$ 975	$ 40
Disposal Group, Including Discontinued Operation, Revenue			190	51	73	168	408
Income (Loss) from Discontinued Operations, before income tax			27	27	8	22	125
Goodwill								1
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	$ 70	$ 142								$ 20