EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended		9 Months Ended
	Apr. 09, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Notes To Consolidated Financial Statements [Abstract]
Net Income Attributable to Controlling Interests		$ 209,501	$ 207,628	$ 608,610	$ 351,229
Basic		315,291,346	314,806,441	315,191,752	264,636,636
Weighted Average Number Diluted Shares Outstanding Adjustment		926,893	999,355	869,379	716,741
Diluted		316,218,239	315,805,796	316,061,131	265,353,377
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount		0	0	2,100	5,688
Basic Earnings Per Common Share		$ 0.66	$ 0.66	$ 1.93	$ 1.33
Diluted Earnings Per Common Share		$ 0.66	$ 0.66	$ 1.93	$ 1.32
Common Stock Issuance Merger With Nstar [Abstract]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	136,000,000