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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)
 12 Months Ended
Dec. 31, 2013
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Net Benefit Costs [Table Text Block]
 Pension and SERP 
  For the Year Ended December 31, 2013 
        NSTAR       
(Millions of Dollars)NU  CL&P Electric (2) PSNH WMECO 
Service Cost$ 102.3 $ 24.9 $ 33.1 $ 13.1 $ 4.7 
Interest Cost  206.7   48.3   58.0   23.6   10.0 
Expected Return on Plan Assets  (278.1)   (73.8)   (84.4)   (35.4)   (17.4) 
Actuarial Loss  210.5   55.9   58.1   21.6   11.8 
Prior Service Cost/(Credit)  4.0   1.8   (0.3)   0.7   0.4 
Total Net Periodic Benefit Expense$ 245.4 $ 57.1 $ 64.5 $ 23.6 $ 9.5 
Related Intercompany Allocations N/A $ 44.9 $ (8.4) $ 10.5 $ 8.0 
Capitalized Pension Expense$ 73.2 $ 28.0 $ 28.9 $ 7.3 $ 5.2 
                 
 Pension and SERP 
  For the Year Ended December 31, 2012 (1) 
        NSTAR       
(Millions of Dollars)NU CL&P Electric (2) PSNH WMECO 
Service Cost$ 84.3 $ 21.8 $ 30.3 $ 11.8 $ 4.1 
Interest Cost  198.3   51.2   58.9   24.4   10.5 
Expected Return on Plan Assets  (220.9)   (70.6)   (65.6)   (28.2)   (16.4) 
Actuarial Loss  172.4   49.6   63.1   16.2   10.7 
Prior Service Cost/(Credit)  7.9   3.6   (0.6)   1.5   0.8 
Total Net Periodic Benefit Expense$ 242.0 $ 55.6 $ 86.1 $ 25.7 $ 9.7 
Curtailments and Settlements$ 2.2 $ - $ - $ - $ - 
Related Intercompany Allocations N/A $ 42.8 $ (12.3) $ 10.1 $ 8.1 
Capitalized Pension Expense$ 70.6 $ 26.8 $ 30.7 $ 7.9 $ 5.1 
                 
  Pension and SERP 
  For the Year Ended December 31, 2011 
        NSTAR       
(Millions of Dollars)NU CL&P Electric (2) PSNH WMECO 
Service Cost$ 55.4 $ 19.5 $ 26.0 $ 10.6 $ 3.9 
Interest Cost  153.3   51.9   61.0   24.4   10.7 
Expected Return on Plan Assets  (170.8)   (76.6)   (71.4)   (19.8)   (17.7) 
Actuarial Loss  84.2   33.4   48.6   10.7   7.1 
Prior Service Cost/(Credit)  9.7   4.2   (0.7)   1.8   0.9 
Total Net Periodic Benefit Expense$ 131.8 $ 32.4 $ 63.5 $ 27.7 $ 4.9 
Related Intercompany Allocations N/A $ 34.1 $ (10.2) $ 7.6 $ 6.2 
Capitalized Pension Expense$ 29.7 $ 16.6 $ 19.8 $ 7.6 $ 2.7 
                 
(1)NSTAR Electric amounts were included in NU beginning April 10, 2012.
(2)NSTAR Electric's allocated expense associated with the NSTAR SERP was $3.2 million, $3.6 million and $4.4 million for the years ended December 31, 2013, 2012 and 2011, respectively, and are not included in the NSTAR Electric amounts in the tables above.

  PBOP
  For the Years Ended December 31,
  2013 2012 2011
(Millions of Dollars)NU CL&P PSNH WMECO NU (1) CL&P PSNH WMECO NU CL&P PSNH WMECO
Service Cost$ 16.9 $ 3.4 $ 2.3 $ 0.7 $ 15.7 $ 3.0 $ 2.0 $ 0.6 $ 9.2 $ 2.9 $ 1.9 $ 0.6
Interest Cost  47.2   7.9   4.0   1.7   49.0   9.2   4.6   2.0   25.7   10.0   4.8   2.2
Expected Return                                    
 on Plan Assets  (55.4)   (10.1)   (5.2)   (2.3)   (39.2)   (9.1)   (4.6)   (2.1)   (21.6)   (8.7)   (4.3)   (2.0)
Actuarial Loss  26.0   7.4   3.6   1.1   36.0   7.5   3.6   1.2   19.0   7.2   3.2   1.1
Prior Service                                    
 Cost/(Credit)  (2.1)   -   -   -   (1.4)   -   -   -   (0.3)   -   -   -
Net Transition                                    
 Obligation Cost (2)  -   -   -   -   12.2   6.1   2.5   1.3   11.6   6.2   2.5   1.3
Total Net Periodic Benefit Expense$ 32.6 $ 8.6 $ 4.7 $ 1.2 $ 72.3 $ 16.7 $ 8.1 $ 3.0 $ 43.6 $ 17.6 $ 8.1 $ 3.2
Related Intercompany Allocations  N/A $ 7.1 $ 1.6 $ 1.3  N/A $ 7.9 $ 2.0 $ 1.5  N/A $ 8.2 $ 2.0 $ 1.5
Capitalized PBOP Expense$ 8.8 $ 3.9 $ 1.3 $ 0.6 $ 26.6 $ 8.2 $ 2.3 $ 1.6 $ 12.7 $ 8.7 $ 2.2 $ 1.5
                                     
(1) NU results include NSTAR PBOP Plan activity beginning April 10, 2012.
(2)The PBOP Plans' transition obligation costs were fully amortized in 2013.
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The accumulated benefit obligation for the Pension and SERP Plans is as follows:
        
  Pension and SERP 
  As of December 31,  
(Millions of Dollars)2013 2012 
NU$ 4,538.8 $ 4,622.1 
CL&P  1,058.0   1,061.8 
NSTAR Electric (1)  1,280.6   1,353.1 
PSNH  520.1   515.9 
WMECO  220.6   221.3 
        
(1)NSTAR Electric amounts do not include the accumulated benefit obligation for the SERP Plan.
        
The following actuarial assumptions were used in calculating the Pension and SERP Plans' year end funded status:
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
The following is a summary of the changes in plan assets and benefit obligations recognized in Regulatory Assets and Other Comprehensive Income (OCI) as well as amounts in Regulatory Assets and OCI reclassified as net periodic benefit expense during the years presented:
                   
 Amounts Reclassified To/From      
 Regulatory Assets OCI      
(Millions of Dollars)For the Years Ended December 31,      
NU Pension and SERP Plans (1)2013 2012 2013 2012      
Actuarial (Gains)/Losses Arising During the Year$ (635.2) $ 245.7 $ (28.9) $ 19.1      
Actuarial Losses Reclassified as Net Periodic Benefit Expense  (201.2)   (164.6)   (9.4)   (7.8)      
Prior Service Cost Reclassified as Net Periodic Benefit Expense (3.8)   (7.7)   (0.2)   (0.2)      
                   
(1) The NU amounts include the NSTAR Pension and SERP Plans beginning April 10, 2012.
                   
The following is a summary of the remaining Regulatory Assets and Accumulated Other Comprehensive Loss amounts that have not been recognized as components of net periodic benefit expense as of December 31, 2013 and 2012, and the amounts that are expected to be recognized as components in 2014:
                   
  Regulatory Assets as of  Expected  AOCI as of Expected
(Millions of Dollars)December 31,   2014 December 31,  2014
NU Pension and SERP Plans2013 2012 Expense 2013 2012 Expense
Actuarial Loss$ 1,137.4 $ 1,973.8 $ 126.2 $ 43.2 $ 81.5 $ 5.6
Prior Service Cost  17.4   21.2   4.2   1.0   1.2   0.2

The following is a summary of the changes in plan assets and benefit obligations recognized in Regulatory Assets and OCI as well as amounts in Regulatory Assets and OCI reclassified as net periodic benefit (expense)/income during the years presented:
                  
  Amounts Reclassified To/From      
 Regulatory Assets OCI      
(Millions of Dollars)For the Years Ended December 31,      
NU PBOP Plans (1)2013 2012 2013 2012      
Actuarial Gains Arising During the Year$(262.0) $(108.6) $ (1.9) $ (1.8)      
Actuarial Losses Reclassified as Net Periodic Benefit Expense  (24.9)  (34.9)   (1.1)   (1.1)      
Prior Service Credit Reclassified as Net Periodic Benefit Income  2.1  1.4   -   -      
Transition Obligation Reclassified as Net Periodic Benefit Expense  -  (11.9)   -  (0.2)      
                  
(1) The NU amounts include the NSTAR PBOP Plan beginning April 10, 2012.
                  
The following is a summary of the remaining Regulatory Assets and Accumulated Other Comprehensive Loss amounts that have not been recognized as components of net periodic benefit expense as of December 31, 2013 and 2012, and the amounts that are expected to be recognized as components in 2014:
                  
  Regulatory Assets as of Expected  AOCI as of Expected
(Millions of Dollars)December 31,  2014  December 31,  2014
NU PBOP Plans 2013 2012 Expense 2013 2012 Expense
Actuarial Loss$ 89.2 $ 376.1 $11.4 $ 6.2 $ 9.2 $ 0.7
Prior Service Credit  (4.6)   (6.7)   (2.8)   -   -   -
Schedule of Assumptions Used [Table Text Block]
  Pension and SERP 
  As of December 31, 
 2013 2012 
NUSCO Pension and SERP Plans       
Discount Rate 5.03%  4.24% 
Compensation/Progression Rate 3.50%  3.50% 
        
NSTAR Pension and SERP Plans      
Discount Rate 4.85%  4.13% 
Compensation/Progression Rate 4.00%  4.00% 

The following actuarial assumptions were used to calculate Pension and SERP expense amounts:
  Pension and SERP    
  For the Years Ended December 31,   
NUSCO Pension and SERP Plans2013  2012  2011    
Discount Rate 4.24%  5.03%  5.57%   
Expected Long-Term Rate of Return 8.25%  8.25%  8.25%   
Compensation/Progression Rate 3.50%  3.50%  3.50%   
             
NSTAR Pension and SERP Plans           
Discount Rate 4.13%  4.52%  5.30%   
Expected Long-Term Rate of Return 8.25%  7.30%  8.00%   
Compensation/Progression Rate 4.00%  4.00%  4.00%   
             

The following actuarial assumptions were used in calculating the PBOP Plans' year end funded status:
           
   PBOP   
   As of December 31,    
  2013 2012   
NUSCO PBOP Plans         
Discount Rate  4.78%  4.04%   
Health Care Cost Trend Rate  7.00%  7.00%   
           
NSTAR PBOP Plan         
Discount Rate  5.10%  4.35%   
Health Care Cost Trend Rate  7.00%  7.10%   

The following actuarial assumptions were used to calculate PBOP expense amounts:
            
   PBOP  
   For the Years Ended December 31,  
  2013  2012  2011  
NUSCO PBOP Plans          
Discount Rate  4.04%  4.84%  5.28% 
Expected Long-Term Rate of Return  8.25%  8.25%  8.25% 
            
NSTAR PBOP Plan          
Discount Rate  4.35%  4.58% N/A  
Expected Long-Term Rate of Return  8.25%  7.30% N/A  

 

The health care cost trend rate assumption used to calculate the 2013 PBOP expense amounts was 7 percent for the NUSCO PBOP Plan, subsequently decreasing by 50 basis points per year to an ultimate rate of 5 percent in 2017, and 7.10 percent for the NSTAR PBOP Plan, subsequently decreasing to an ultimate rate of 4.5 percent in 2024. As of December 31, 2013, the health care cost trend rate assumption used to determine the NUSCO and NSTAR PBOP Plans' year end funded status is 7 percent, subsequently decreasing to an ultimate rate of 4.5 percent in 2024.

 

Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plans. The effect of changing the assumed health care cost trend rate by one percentage point for the year ended December 31, 2013 would have the following effects:
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
(Millions of Dollars)One Percentage One Percentage
NU PBOP PlansPoint Increase Point Decrease
Effect on Postretirement Benefit Obligation$ 85.8 $ (70.4)
Effect on Total Service and Interest Cost Components  7.1   (5.5)
Schedule of Expected Benefit Payments [Table Text Block]
Estimated Future Benefit Payments: The following benefit payments, which reflect expected future service, are expected to be paid by the Pension, SERP and PBOP Plans:
         
(Millions of Dollars)Pension      
NU and SERP PBOP   
2014$ 263.3 $ 61.6   
2015  273.3   63.3   
2016  282.9   64.5   
2017  287.4   65.6   
2018  299.4   66.6   
2019-2023  1,617.0   344.4   
         
NSTAR Pension Plan        
2014$ 88.0  N/A   
2015  90.6  N/A   
2016  88.4  N/A   
2017  88.5  N/A   
2018  90.0  N/A   
2019-2023  449.2  N/A   
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]
  Pension and SERP
NUAs of December 31,
(Millions of Dollars)2013 2012 (1)
Change in Benefit Obligation     
Benefit Obligation as of Beginning of Year$ (5,022.8) $ (3,098.9)
Liabilities Assumed from Merger with NSTAR  -   (1,409.7)
Service Cost  (102.3)   (84.3)
Interest Cost  (206.7)   (198.3)
Actuarial Gain/(Loss)  433.6   (429.7)
Benefits Paid - Pension  216.6   187.7
Benefits Paid - SERP  5.1   4.2
SERP Curtailment  -   6.2
Benefit Obligation as of End of Year$ (4,676.5) $ (5,022.8)
Change in Pension Plan Assets     
Fair Value of Plan Assets as of Beginning of Year$ 3,411.3 $ 2,005.9
Assets Assumed from Merger with NSTAR  -   984.7
Employer Contributions  284.7   222.4
Actual Return on Plan Assets  506.5   386.0
Benefits Paid   (216.6)   (187.7)
Fair Value of Plan Assets as of End of Year$ 3,985.9 $ 3,411.3
Funded Status as of December 31st$ (690.6) $ (1,611.5)

  Pension and SERP
  As of December 31, 2013 As of December 31, 2012
     NSTAR          NSTAR      
(Millions of Dollars)CL&P Electric (2) PSNH WMECO CL&P Electric (2) PSNH WMECO
Change in Benefit Obligation                       
Benefit Obligation as of Beginning of Year$ (1,178.0) $ (1,430.0) $ (576.0) $ (243.1) $ (1,043.8) $ (1,346.2) $ (497.9) $ (215.8)
Service Cost  (24.9)   (33.1)   (13.1)   (4.7)   (21.8)   (30.3)   (11.8)   (4.1)
Interest Cost  (48.3)   (58.0)   (23.6)   (10.0)   (51.2)   (58.9)   (24.4)   (10.5)
Actuarial Gain/(Loss)  110.7   96.6   62.4   22.4   (117.4)   (63.6)   (61.3)   (24.0)
Benefits Paid - Pension  56.6   71.2   21.1   11.5   55.9   69.0   19.7   11.3
Benefits Paid - SERP  0.5   -   0.2   -   0.3   -   -   -
SERP Curtailment   -   -   -   -   -   -   (0.3)   -
Benefit Obligation as of End of Year$ (1,083.4) $ (1,353.3) $ (529.0) $ (223.9) $ (1,178.0) $ (1,430.0) $ (576.0) $ (243.1)
Change in Pension Plan Assets                       
Fair Value of Plan Assets as of Beginning of Year$ 937.6 $ 1,069.1 $ 386.6 $ 218.5 $ 869.6 $ 988.5 $ 279.7 $ 202.0
Employer Contributions  -   82.0   108.3   -   -   25.0   87.7   -
Actual Return on Plan Assets  135.3   155.4   54.8   33.4   123.9   124.6   38.9   27.8
Benefits Paid   (56.6)   (71.2)   (21.1)   (11.5)   (55.9)   (69.0)   (19.7)   (11.3)
Fair Value of Plan Assets as of End of Year$ 1,016.3 $ 1,235.3 $ 528.6 $ 240.4 $ 937.6 $ 1,069.1 $ 386.6 $ 218.5
Funded Status as of December 31st$ (67.1) $ (118.0) $ (0.4) $ 16.5 $ (240.4) $ (360.9) $ (189.4) $ (24.6)
                         
(1) NSTAR amounts were included in NU beginning April 10, 2012. 
                         
(2) NSTAR Electric amounts do not include benefit obligations of the NSTAR SERP Plan. 
  
As of December 31, 2013, prepaid pension assets of $3 million and $17 million for PSNH and WMECO, respectively, were included in Other Long-term Assets on their accompanying balance sheets. Pension and SERP benefits funded status includes the current portion of the SERP liability, which is included in Other Current Liabilities on the accompanying balance sheets.
                         
Although NU maintains marketable securities in a supplemental benefit trust, the plan itself does not contain any assets. See Note 6, "Marketable Securities," to the financial statements.

  PBOP
  As of December 31,
  2013 2012
(Millions of Dollars)NU CL&P PSNH WMECO NU (1) CL&P PSNH WMECO
Change in Benefit Obligation                       
Benefit Obligation as of Beginning of Year$ (1,233.3) $ (196.8) $ (100.2) $ (42.5) $ (520.9) $ (198.9) $ (99.2) $ (42.9)
Liabilities Assumed from Merger with NSTAR  -   -   -   -   (770.6)   -   -   -
Service Cost  (16.9)   (3.4)   (2.3)   (0.7)   (15.7)   (3.0)   (2.0)   (0.6)
Interest Cost  (47.2)   (7.9)   (4.0)   (1.7)   (49.0)   (9.2)   (4.6)   (2.0)
Actuarial Gain  200.9   13.3   7.2   3.3   70.9   1.2   0.3   0.1
Federal Subsidy on Benefits Paid  -   -   -   -   (6.2)   (1.7)   (0.6)   (0.3)
Benefits Paid  58.5   14.4   5.8   2.9   58.2   14.8   5.9   3.2
Benefit Obligation as of End of Year$ (1,038.0) $ (180.4) $ (93.5) $ (38.7) $ (1,233.3) $ (196.8) $ (100.2) $ (42.5)
Change in Plan Assets                       
Fair Value of Plan Assets as of Beginning of Year$ 709.1 $ 132.2 $ 69.5 $ 31.0 $ 285.4 $ 112.2 $ 58.7 $ 27.1
Assets Assumed from Merger with NSTAR  -   -   -   -   330.4   -   -   -
Actual Return on Plan Assets  118.3   24.8   13.4   6.0   78.8   15.0   7.5   3.5
Employer Contributions  57.6   8.7   4.7   1.2   72.7   19.8   9.2   3.6
Benefits Paid  (58.5)   (14.4)   (5.8)   (2.9)   (58.2)   (14.8)   (5.9)   (3.2)
Fair Value of Plan Assets as of End of Year$ 826.5 $ 151.3 $ 81.8 $ 35.3 $ 709.1 $ 132.2 $ 69.5 $ 31.0
Funded Status as of December 31st$ (211.5) $ (29.1) $ (11.7) $ (3.4) $ (524.2) $ (64.6) $ (30.7) $ (11.5)
                         
(1)NU results include NSTAR PBOP Plan activity beginning April 10, 2012.
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
  NU Pension Plans   
  United       Real Estate    
  States   Private Fixed and Other Hedge  
(Millions of Dollars)Equity International Equity Income Assets Funds Total
Balance as of January 1, 2012$ 259.4 $ - $ 255.1 $ 276.2 $ 71.8 $ 240.0 $ 1,102.5
Assets Assumed from Merger with NSTAR  -  41.4   -   -   111.0   126.6   279.0
Actual Return/(Loss) on Plan Assets:                    
 Relating to Assets Still Held as of Year End  11.2  10.7   17.0   42.1   5.7   21.8   108.5
 Relating to Assets Distributed During the Year  -   -   15.0   0.7   7.6   (0.3)   23.0
Purchases, Sales and Settlements  -   -   (19.2)   (3.9)   39.3   30.8   47.0
Balance as of December 31, 2012$ 270.6 $ 52.1 $ 267.9 $ 315.1 $ 235.4 $ 418.90$ 1,560.0
Transfer Between Categories  -   -   -   32.5   -   (32.5)   -
Actual Return/(Loss) on Plan Assets:                    
 Relating to Assets Still Held as of Year End  11.2   9.4   15.4   55.3   12.9   33.4   137.6
 Relating to Assets Distributed During the Year  12.2   -   13.7   (1.0)   6.2   -   31.1
Purchases, Sales and Settlements  (100.0)   -   3.3   187.6   34.0   (2.9)   122.0
Balance as of December 31, 2013$ 194.0 $ 61.5 $ 300.3 $ 589.5 $ 288.5 $ 416.9 $ 1,850.7
                      
  NU PBOP Plans   
  United       Real Estate         
  States Private Fixed and Other  Hedge      
(Millions of Dollars)Equity Equity Income Assets  Funds  Total   
Balance as of January 1, 2012$ 10.7 $ 5.1 $ 26.0 $ 2.5 $ 16.1 $ 60.4   
Assets Assumed from Merger with NSTAR  19.7   -   -   18.4   21.4   59.5   
Actual Return on Plan Assets:                    
 Relating to Assets Still Held as of Year End  5.9   1.6   4.0   3.0   2.1   16.6   
Purchases, Sales and Settlements  -   4.6   2.1   2.8   -   9.5   
Balance as of December 31, 2012$ 36.3 $ 11.3 $ 32.1 $ 26.7 $ 39.6 $ 146.0   
Actual Return/(Loss) on Plan Assets:           -         
 Relating to Assets Still Held as of Year End  20.8   1.5   4.1   3.9   5.4   35.7   
 Relating to Assets Distributed During the Year  -   0.2   -   (0.1)   -   0.1   
Purchases, Sales and Settlements  12.0   4.9   15.3   3.4   12.0   47.6   
Balance as of December 31, 2013$ 69.1 $ 17.9 $ 51.5 $ 33.9 $ 57.0 $ 229.4   
                      
  NSTAR Pension Plan
  United          Real Estate      
  States    Private Fixed and Other  Hedge   
(Millions of Dollars)Equity International  Equity Income Assets  Funds  Total
Balance as of January 1, 2012$ - $ 41.4 $ - $ - $ 111.0 $ 126.6 $ 279.0
Actual Return/(Loss) on Plan Assets:                    
 Relating to Assets Still Held as of Year End  -   10.7   -   -   9.9   5.6   26.2
 Relating to Assets Distributed During the Year  -   -   -   -   -   (0.3)   (0.3)
Purchases, Sales and Settlements  -   -   -   -   6.3   (9.2)   (2.9)
Balance as of December 31, 2012$ - $ 52.1 $ - $ - $ 127.2 $ 122.7 $ 302.0
Transfer of Assets into NUSCO Pension Plan Trust  80.5   (36.6) $ 79.7   93.8   (57.1)   2.0   162.3
Transfer Between Categories  -   -   -   9.7   -   (9.7)   -
Actual Return/(Loss) on Plan Assets:                    
 Relating to Assets Still Held as of Year End 3.5   2.8   4.6   16.4  3.5  9.9   40.7
 Relating to Assets Distributed During the Year 3.6   -   4.2   (0.3)  1.8   -   9.3
Purchases, Sales and Settlements  (29.8)   -   0.9   55.8  10.2   (0.8)   36.3
Balance as of December 31, 2013$ 57.8 $ 18.3 $ 89.4 $ 175.4 $ 85.6 $ 124.1 $ 550.6
Schedule of Allocation of Plan Assets [Table Text Block]
  As of December 31,
  2013 2012
  NUSCO and NSTAR Pension  NUSCO Pension         
  and Tax-Exempt PBOP Plans(1) and PBOP Plans NSTAR Pension Plan NSTAR PBOP Plan
  Target Assumed Target Assumed Target Assumed Target Assumed
  Asset Rate Asset Rate Asset Rate Asset Rate
  Allocation of Return Allocation of Return Allocation of Return Allocation of Return
Equity Securities:               
 United States24% 9% 24% 9% 25% 8.3% 25% 8.3%
 International10% 9% 13% 9% 13% 8.6% 20% 8.6%
 Emerging Markets6% 10% 3% 10% 5% 8.8% 5% 8.8%
 Private Equity10% 13% 12% 13% - - - -
Debt Securities:               
 Fixed Income15% 5% 20% 5% 21% 4.6% 30% 4.6%
 High Yield Fixed Income9% 7.5% 3.5% 7.5% 9% 6.5% - -
 Emerging Markets Debt6% 7.5% 3.5% 7.5% 4% 6.4% - -
Real Estate and Other Assets9% 7.5% 8% 7.5% 10% 7.9% 10% 7.9%
Hedge Funds11% 7% 13% 7% 13% 8.4% 10% 8.4%
                 

   NU Pension Plans
   Fair Value Measurements as of December 31,
 (Millions of Dollars)2013 2012
 Asset Category:Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total
 Equity Securities:                       
  United States (1)$ 294.6 $ 597.7 $ 194.0 $ 1,086.3 $ 336.5 $ 302.8 $ 270.6 $ 909.9
  International (1)  32.2   362.6   61.5   456.3   42.0   362.6   52.1   456.7
  Emerging Markets (1)  -   211.8   -   211.8   -   135.3   -   135.3
  Private Equity   96.4   -   300.3   396.7   26.7   -   267.9   294.6
 Fixed Income(2)  11.6   605.1   589.5   1,206.2   54.9   629.2   315.1   999.2
 Real Estate and Other Assets  -   88.2   288.5   376.7   -   78.9   235.4   314.3
 Hedge Funds  -   -   416.9   416.9   -   -   418.9   418.9
 Total Master Trust Assets$ 434.8 $ 1,865.4 $ 1,850.7 $ 4,150.9 $ 460.1 $ 1,508.8 $ 1,560.0 $ 3,528.9
  Less: 401(h) PBOP Assets(3)           (165.0)            (117.6)
 Total Pension Assets         $ 3,985.9          $ 3,411.3
                          
   NSTAR Pension Plan
   Fair Value Measurements as of December 31,
 (Millions of Dollars)2013 2012
 Asset Category:Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total
 Equity Securities:                       
  United States (1)$ 87.7 $ 177.9 $ 57.8 $ 323.4 $ 96.7 $ 246.4 $ - $ 343.1
  International(1)  9.6   108.0   18.3   135.9   -   98.3   52.1   150.4
  Emerging Markets(1)  -   63.1   -   63.1   -   55.9   -   55.9
  Private Equity  28.7   -   89.4   118.1            
 Fixed Income(2)  3.4   180.0   175.4   358.8   54.9   292.5   -   347.4
 Real Estate and Other Assets  -   26.3   85.6   111.9   -   -   127.2   127.2
 Hedge Funds  -   -   124.1   124.1   -   -   122.7   122.7
 Total Master Trust Assets$ 129.4 $ 555.3 $ 550.6 $ 1,235.3 $ 151.6 $ 693.1 $ 302.0 $ 1,146.7
  Less: 401(h) PBOP Assets(3)                       (77.6)
 Total Pension Assets                     $ 1,069.1
                          
   NU PBOP Plans
   Fair Value Measurements as of December 31,
 (Millions of Dollars)2013 2012
 Asset Category:Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total
 Cash and Cash Equivalents$ 11.1 $ - $ - $ 11.1 $ 9.7 $ - $ - $ 9.7
 Equity Securities:                       
  United States(1)  67.0   120.6   69.1   256.7   116.3   57.7   36.3   210.3
  International(1)  28.1   42.8   -   70.9   68.0   29.7   -   97.7
  Emerging Markets(1)  15.2   13.4   -   28.6   7.7   14.0   -   21.7
  Private Equity  -   -   17.9   17.9   -   -   11.3   11.3
 Fixed Income (2)  -   119.7   51.5   171.2   -   137.7   32.1   169.8
 Real Estate and Other Assets  -   14.2   33.9   48.1   -   4.7   26.7   31.4
 Hedge Funds  -   -   57.0   57.0   -   -   39.6   39.6
 Total$ 121.4 $ 310.7 $ 229.4 $ 661.5 $ 201.7 $ 243.8 $ 146.0 $ 591.5
  Add: 401(h) PBOP Assets(3)           165.0            117.6
 Total PBOP Assets         $ 826.5          $ 709.1