2.4.0.8100250 - Disclosure - EARNINGS PER SHAREtruefalsefalse1false falsefalseFROM_Jan01_2013_TO_Jun30_2013http://www.sec.gov/CIK0000072741duration2013-01-01T00:00:002013-06-30T00:00:001true 1nu_NotesToConsolidatedFinancialStatementsAbstractnu_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Notes To Consolidated Financial Statements [Abstract]2false 2us-gaap_EarningsPerShareTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse0013.       EARNINGS PER SHARE Basic EPS is computed based upon the weighted average number of common shares outstanding during each period. Diluted EPS is computed on the basis of the weighted average number of common shares outstanding plus the potential dilutive effect if certain share-based compensation awards are converted into common shares. There were no antidilutive share awards outstanding for the three months ended June 30, 2013. For the six months ended June 30, 2013, there were 3,150 share awards excluded from the computation as these awards were antidilutive. For the three and six months ended June 30, 2012, there were 17,065 and 8,533, respectively, antidilutive share awards excluded from the calculation. The following table sets forth the components of basic and diluted EPS:<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 10px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 233px; text-align:left;border-color:#000000;min-width:233px;"> </td><td colspan="5" style="width: 210px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:210px;">For the Three Months Ended</td><td style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"> </td><td colspan="5" style="width: 210px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:210px;">For the Six Months Ended</td><td style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"> </td></tr><tr style="height: 10px"><td colspan="2" style="width: 242px; text-align:left;border-color:#000000;min-width:242px;">(Millions of Dollars, except share information)</td><td colspan="2" style="width: 100px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:100px;">June 30, 2013</td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 100px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:100px;">June 30, 2012</td><td style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 100px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:100px;">June 30, 2013</td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 100px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:100px;">June 30, 2012</td><td style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"> </td></tr><tr style="height: 10px"><td colspan="2" style="width: 242px; text-align:left;border-color:#000000;min-width:242px;">Net Income Attributable to Controlling Interest</td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;">$</td><td style="width: 90px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 171.0</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;">$</td><td style="width: 90px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 44.3</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;">$</td><td style="width: 90px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 399.1</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;">$</td><td style="width: 90px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 143.6</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td></tr><tr style="height: 10px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 233px; text-align:left;border-color:#000000;min-width:233px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:90px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:90px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:90px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:90px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td></tr><tr style="height: 10px"><td colspan="2" style="width: 242px; text-align:left;border-color:#000000;min-width:242px;">Weighted Average Common Shares Outstanding:</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td></tr><tr style="height: 10px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 233px; text-align:left;border-color:#000000;min-width:233px;">Basic </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; text-align:right;border-color:#000000;min-width:90px;"> 315,154,130</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; text-align:right;border-color:#000000;min-width:90px;"> 301,047,753</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; text-align:right;border-color:#000000;min-width:90px;"> 315,141,956</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; text-align:right;border-color:#000000;min-width:90px;"> 239,551,735</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td></tr><tr style="height: 10px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 233px; text-align:left;border-color:#000000;min-width:233px;">Dilutive Effect </td><td style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 808,489</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 769,131</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 840,622</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 575,434</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td></tr><tr style="height: 10px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 233px; text-align:left;border-color:#000000;min-width:233px;">Diluted</td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 315,962,619</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 301,816,884</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 315,982,578</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 90px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 240,127,169</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td></tr><tr style="height: 10px"><td colspan="2" style="width: 242px; text-align:left;border-color:#000000;min-width:242px;">Basic EPS</td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;">$</td><td style="width: 90px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 0.54</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;">$</td><td style="width: 90px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 0.15</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;">$</td><td style="width: 90px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 1.27</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;">$</td><td style="width: 90px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 0.60</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td></tr><tr style="height: 10px"><td colspan="2" style="width: 242px; text-align:left;border-color:#000000;min-width:242px;">Diluted EPS</td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;">$</td><td style="width: 90px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 0.54</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;">$</td><td style="width: 90px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 0.15</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;">$</td><td style="width: 90px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 1.26</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;">$</td><td style="width: 90px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:90px;"> 0.60</td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td></tr></table></div>On April 10, 2012, NU issued approximately 136 million common shares as a result of the merger with NSTAR, which are reflected in weighted average common shares outstanding for all periods presented. RSUs and performance shares are included in basic weighted average common shares outstanding as of the date that all necessary vesting conditions have been satisfied. The dilutive effect of unvested RSUs and performance shares is calculated using the treasury stock method. Assumed proceeds of these units under the treasury stock method consist of the remaining compensation cost to be recognized and a theoretical tax benefit. The theoretical tax benefit is calculated as the tax impact of the intrinsic value of the units (the difference between the market value of the average units outstanding for the period, using the average market price during the period, and the grant date market value).  The dilutive effect of stock options to purchase common shares is also calculated using the treasury stock method. Assumed proceeds for stock options consist of cash proceeds that would be received upon exercise, and a theoretical tax benefit. The theoretical tax benefit is calculated as the tax impact of the intrinsic value of the stock options (the difference between the market value of the average stock options outstanding for the period, using the average market price during the period, and the exercise price).falsefalsefalsenonnum:textBlockItemTypenaThe entire disclosure for earnings per share.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 false0Earnings Per Share [Text Block]falseEARNINGS PER SHAREUnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.nu.com/role/DisclosureEARNINGSPERSHARE12