This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items before deduction or consideration of the amount which may be allocable to noncontrolling interests, if any. Includes the following (net of 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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+ Details

Discontinued Operations (Details) (USD $)	3 Months Ended				12 Months Ended			1 Months Ended	0 Months Ended
Discontinued Operations (Details) (USD $)	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Feb. 17, 2011 New England Gas Company [Member]	Oct. 02, 2009 New England Gas Company [Member]
Discontinued Operations [Line Items]
Court Imposed Fine									$ 6,000,000
Community Service Payment									12,000,000
Single Day Maximum Fine								50,000
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ (18,100,000)	$ 0	$ 0	$ 0	$ 0	$ (18,100,000)	$ 0