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INCOME TAXES (Tables)
12 Months Ended
Dec. 31, 2014
Notes To Consolidated Financial Statements [Abstract]  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
NU For the Years Ended December 31,
(Millions of Dollars)2014 2013 2012 (1)
Current Income Taxes:        
Federal$4.4 $8.8 $(30.9)
State 24.5  (9.4)  17.6
Total Current 28.9  (0.6)  (13.3)
Deferred Income Taxes, Net:        
Federal 406.8  386.2  291.3
State 36.5  45.4  0.8
Total Deferred  443.3  431.6  292.1
Investment Tax Credits, Net (3.9)  (4.1)  (3.9)
Income Tax Expense$468.3 $426.9 $274.9
         
(1) NSTAR amounts were included in NU beginning April 10, 2012.

  For the Years Ended December 31,
  2014 2013 2012
     NSTAR          NSTAR          NSTAR      
(Millions of Dollars)CL&P Electric  PSNH WMECO CL&P Electric PSNH WMECO CL&P Electric PSNH WMECO
Current Income Taxes:                                  
 Federal$ (0.2) $ 75.0 $ (22.6) $ 1.9 $ 20.1 $ 95.8 $ (8.2) $ (53.4) $ (47.8) $ 93.5 $ (0.9) $ (24.7)
 State  4.3   20.2   (0.1)   1.8   (6.7)   29.6   3.6   4.2   3.1   27.6   3.4   3.4
Total Current  4.1   95.2   (22.7)   3.7   13.4   125.4   (4.6)   (49.2)   (44.7)   121.1   2.5   (21.3)
Deferred Income Taxes, Net:                                   
 Federal  138.0   88.0   79.6   28.1   114.9   49.8   64.5   84.7   141.5   11.4   46.5   51.2
 State  (7.1)   20.1   15.2   6.0   15.1   (1.0)   11.2   2.3   (0.5)   (7.1)   12.0   2.7
Total Deferred   130.9   108.1   94.8   34.1   130.0   48.8   75.7   87.0   141.0   4.3   58.5   53.9
Investment Tax Credits, Net  (1.5)   (1.3)   -   (0.5)   (1.7)   (1.3)   -   (0.4)   (1.9)   (1.4)   -   (0.5)
Income Tax Expense$ 133.5 $ 202.0 $ 72.1 $ 37.3 $ 141.7 $ 172.9 $ 71.1 $ 37.4 $ 94.4 $ 124.0 $ 61.0 $ 32.1
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
A reconciliation between income tax expense and the expected tax expense at the statutory rate is as follows:
             
NU For the Years Ended December 31, 
(Millions of Dollars, except percentages)2014  2013  2012 (1) 
Income Before Income Tax Expense$ 1,295.4  $ 1,220.6  $ 808.0 
            
Statutory Federal Income Tax Expense at 35%  453.4    427.2    282.8 
Tax Effect of Differences:           
 Depreciation  (5.6)    (7.4)    (10.8) 
 Investment Tax Credit Amortization  (3.9)    (4.1)    (3.9) 
 Other Federal Tax Credits  (3.5)    (3.7)    (3.8) 
 State Income Taxes, Net of Federal Impact  42.5    27.6    4.4 
 Dividends on ESOP  (8.0)    (8.0)    (6.4) 
 Tax Asset Valuation Allowance/Reserve Adjustments  (2.9)    (4.3)    7.6 
 Other, Net  (3.7)    (0.4)    5.0 
Income Tax Expense$ 468.3  $ 426.9  $ 274.9 
Effective Tax Rate 36.2%   35.0%   34.0% 
             
(1) NSTAR amounts were included in NU beginning April 10, 2012. 

  For the Years Ended December 31,
  2014 2013 2012
(Millions of Dollars,   NSTAR          NSTAR          NSTAR      
 except percentages)CL&P Electric PSNH WMECO CL&P Electric PSNH WMECO CL&P Electric PSNH WMECO
Income Before Income Tax Expense$ 421.2 $ 505.1 $ 186.1 $ 95.1 $ 421.1 $ 441.4 $ 182.5 $ 97.8 $ 304.2 $ 314.2 $ 157.9 $ 86.6
                                     
Statutory Federal Income Tax Expense at 35%  147.4   176.8   65.1   33.3   147.4   154.5   63.9   34.2   106.5   110.0   55.3   30.3
Tax Effect of Differences:                                   
 Depreciation  (3.6)   (1.3)   0.3   (0.2)   (7.0)   0.1   0.6   -   (9.0)   -   (0.3)   0.2
 Investment Tax Credit Amortization  (1.5)   (1.3)   -   (0.5)   (1.7)   (1.3)   -   (0.4)   (1.9)   (1.4)   -   (0.5)
 Other Federal Tax Credits  -   -   (3.5)   -   -   -   (3.7)   -   -   -   (3.8)   -
 State Income Taxes, Net of Federal Impact  4.4   26.2   9.8   5.0   5.0   18.6   9.6   4.2   0.1   13.4   10.0   4.0
 Tax Asset Valuation Allowance/ Reserve Adjustments (6.3)   -   -   -   0.4   -   -   -   1.6   -   -   -
 Other, Net  (6.9)   1.6   0.4   (0.3)   (2.4)   1.0   0.7   (0.6)   (2.9)   2.0   (0.2)   (1.9)
Income Tax Expense$ 133.5 $ 202.0 $ 72.1 $ 37.3 $ 141.7 $ 172.9 $ 71.1 $ 37.4 $ 94.4 $ 124.0 $ 61.0 $ 32.1
Effective Tax Rate 31.7%  40.0%  38.7%  39.2%  33.6%  39.2%  39.0%  38.2%  31.0%  39.5%  38.6%  37.1%
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
NUAs of December 31,
(Millions of Dollars)2014 2013
Deferred Tax Assets:     
 Employee Benefits$ 632.2 $ 435.2
 Derivative Liabilities  199.6   272.9
 Regulatory Deferrals - Liabilities  366.7   272.7
 Allowance for Uncollectible Accounts  60.5   65.0
 Tax Effect - Tax Regulatory Liabilities  10.0   16.2
 Federal Net Operating Loss Carryforwards  59.1   158.0
 Purchase Accounting Adjustment  126.2   132.8
 Other  198.7   230.6
Total Deferred Tax Assets  1,653.0   1,583.4
 Less: Valuation Allowance  5.1   24.3
Net Deferred Tax Assets$ 1,647.9 $ 1,559.1
Deferred Tax Liabilities:     
 Accelerated Depreciation and Other Plant-Related Differences$ 4,215.9 $ 3,806.5
 Property Tax Accruals  109.6   95.1
 Regulatory Amounts:     
  Regulatory Deferrals - Assets  1,277.9   1,146.7
  Tax Effect - Tax Regulatory Assets  240.2   248.2
  Goodwill Regulatory Asset - 1999 Merger  203.2   211.5
  Derivative Assets  32.6   30.1
  Other  196.3   157.1
Total Deferred Tax Liabilities$ 6,275.7 $ 5,695.2

   As of December 31,
   2014 2013
      NSTAR           NSTAR      
(Millions of Dollars)CL&P Electric PSNH WMECO CL&P Electric  PSNH WMECO
Deferred Tax Assets:                       
 Employee Benefits$ 129.0 $ 39.9 $ 46.8 $ 9.2 $ 56.0 $ 38.3 $ 15.5 $ (1.8)
 Derivative Liabilities  193.0   1.8   -   -   272.4   3.3   -   (2.9)
 Regulatory Deferrals - Liabilities  73.9   181.3   46.5   11.4   61.5   114.7   40.9   1.0
 Allowance for Uncollectible Accounts  32.3   13.8   3.2   3.8   31.2   15.4   3.1   3.3
 Tax Effect - Tax Regulatory Liabilities  3.1   1.8   2.1   2.5   4.7   5.4   2.1   1.6
 Federal Net Operating Loss Carryforwards  -   -   32.1   4.5   51.0   -   56.6   18.6
 Other  53.8   19.9   48.9   4.9   75.3   31.3   40.3   8.3
Total Deferred Tax Assets  485.1   258.5   179.6   36.3   552.1   208.4   158.5   28.1
 Less: Valuation Allowance  4.0   -   -   -   23.1   -   -   -
Net Deferred Tax Assets$ 481.1 $ 258.5 $ 179.6 $ 36.3 $ 529.0 $ 208.4 $ 158.5 $ 28.1
Deferred Tax Liabilities:                       
 Accelerated Depreciation and Other Plant-Related Differences $ 1,378.6 $ 1,296.9 $ 596.6 $ 385.8 $ 1,238.1 $ 1,179.4 $ 526.6 $ 361.1
 Property Tax Accruals  58.1   25.0   7.4   12.8   49.3   25.3   7.1   5.9
 Regulatory Amounts:                       
  Regulatory Deferrals - Assets  502.3   276.0   147.6   60.4   550.4   276.2   109.3   49.3
  Tax Effect - Tax Regulatory Assets  166.9   35.5   15.9   9.3   160.1   36.0   16.3   18.2
  Goodwill Regulatory Asset - 1999 Merger -   174.4   -   -   -   181.6   -   -
  Derivative Assets  32.6   -   -   -   29.0   0.5   -   -
  Other  19.4   33.5   35.6   2.8   20.6   26.4   28.0   3.6
Total Deferred Tax Liabilities$ 2,157.9 $ 1,841.3 $ 803.1 $ 471.1 $ 2,047.5 $ 1,725.4 $ 687.3 $ 438.1
Summary of Operating Loss Carryforwards [Table Text Block]
Carryforwards: The following tables provide the amounts and expiration dates of state tax credit and loss carryforwards and federal tax credit and net operating loss carryforwards:
                  
 As of December 31, 2014 
       NSTAR          
(Millions of Dollars)NU CL&P Electric PSNH WMECO Expiration Range 
Federal Net Operating Loss $ 168.8 $ - $ - $ 91.8 $ 12.7 2031 - 2032 
Federal Tax Credit   16.3   0.1   0.2   11.1   - 2031 - 2034 
Federal Charitable Contribution  19.4   -   -   -   - 2016 - 2018 
State Tax Credit   99.7   71.0   -   -   - 2014 - 2019 
State Loss Carryforwards  40.6   -   -   -   - 2014 - 2034 
State Charitable Contribution  2.1   -   -   -   - 2015 - 2018 
                  
 As of December 31, 2013 
       NSTAR          
(Millions of Dollars)NU CL&P Electric PSNH WMECO Expiration Range 
Federal Net Operating Loss $ 451.3 $ 145.8 $ - $ 161.8 $ 53.3 2031 - 2032 
Federal Tax Credit   8.0   -   -   7.6   - 2031 - 2033 
Federal Charitable Contribution  33.7   -   -   -   - 2015 - 2017 
State Tax Credit  104.7   86.8   -   -   - 2013 - 2018 
State Loss Carryforwards  12.1   -   -   -   - 2013 - 2015 
State Charitable Contribution  1.0   -   -   -   - 2015 
Summary of Income Tax Contingencies [Table Text Block]
(Millions of Dollars)NU CL&P
Balance as of January 1, 2012$ 73.5 $ 46.5
 Gross Increases - Current Year 10.3  2.5
 Gross Increases - Prior Year 0.1   -
 Gross Decreases - Prior Year (0.8)   -
Balance as of December 31, 2012 83.1  49.0
 Gross Increases - Current Year  8.2   2.1
 Gross Decreases - Prior Year  (1.1)   (0.3)
 Settlements  (49.8)   (39.4)
 Lapse of Statute of Limitations  (2.2)   -
Balance as of December 31, 2013 38.2  11.4
 Gross Increases - Current Year   9.3   2.7
 Gross Increases - Prior Year  0.3   0.2
 Lapse of Statute of Limitations  (1.6)   -
Balance as of December 31, 2014$46.2 $14.3

Other Interest For the Years Ended December 31, Accrued Interest As of December 31,
Expense/(Income) 2014 2013 2012 Expense 2014 2013
(Millions of Dollars)          (Millions of Dollars)      
NU (1) $ 0.4 $ (8.6) $ 3.1 NU  $ 1.9 $ 1.5
CL&P   -   (4.0)   1.3 CL&P   -   -