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EMPLOYEE BENEFITS - Schedule of Pension Benefit Obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension and SERP      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation as of Beginning of Year $ (5,238.4) $ (5,220.1)  
Service Cost (44.3) (43.1) $ (70.1)
Interest Cost (250.0) (254.0) (154.5)
Actuarial Gain/(Loss) 280.2 (110.4)  
Benefits Paid 320.9 317.3  
Benefits Paid - Lump Sum 24.0 28.9  
Benefits Paid - SERP 19.4 43.0  
Employee Transfers 0.0 0.0  
Reclassified to Assets Held for Sale 142.5 0.0  
Benefit Obligation as of End of Year (4,745.7) (5,238.4) (5,220.1)
Change in Pension Plan Assets:      
Fair Value of Plan Assets as of Beginning of Year 5,775.0 5,806.4  
Employer Contributions 5.0 5.0  
Actual Return on Plan Assets 227.0 309.8  
Benefits Paid - Pension (320.9) (317.3)  
Benefits Paid - Lump Sum (24.0) (28.9)  
Employee Transfers 0.0 0.0  
Reclassified to Assets Held for Sale 148.1 0.0  
Fair Value of Plan Assets as of End of Year 5,514.0 5,775.0 5,806.4
Funded Status as of December 31st 768.3 536.6  
PBOP      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation as of Beginning of Year (676.0) (693.7)  
Service Cost (7.0) (7.6) (11.6)
Interest Cost (31.9) (33.8) (20.2)
Actuarial Gain/(Loss) 41.3 5.0  
Benefits Paid 51.7 52.7  
Employee Transfers 0.0 0.0  
Reclassified to Assets Held for Sale 34.5 0.0  
Plan Amendment 0.0 1.4  
Benefit Obligation as of End of Year (587.4) (676.0) (693.7)
Change in Pension Plan Assets:      
Fair Value of Plan Assets as of Beginning of Year 1,024.4 970.1  
Employer Contributions 0.9 1.9  
Actual Return on Plan Assets 92.3 104.7  
Benefits Paid - Pension (51.8) (52.3)  
Employee Transfers 0.0 0.0  
Reclassified to Assets Held for Sale 29.5 0.0  
Fair Value of Plan Assets as of End of Year 1,036.3 1,024.4 970.1
Funded Status as of December 31st 448.9 348.4  
CL&P | Pension and SERP      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation as of Beginning of Year (1,048.5) (1,030.0)  
Service Cost (12.7) (12.3) (18.7)
Interest Cost (50.3) (50.5) (31.3)
Actuarial Gain/(Loss) 56.2 (19.7)  
Benefits Paid 68.1 66.1  
Benefits Paid - Lump Sum 0.0 0.0  
Benefits Paid - SERP 0.3 0.3  
Employee Transfers 4.0 (2.4)  
Reclassified to Assets Held for Sale 0.0 0.0  
Benefit Obligation as of End of Year (982.9) (1,048.5) (1,030.0)
Change in Pension Plan Assets:      
Fair Value of Plan Assets as of Beginning of Year 1,170.0 1,172.0  
Employer Contributions 0.0 0.0  
Actual Return on Plan Assets 46.5 61.7  
Benefits Paid - Pension (68.1) (66.1)  
Benefits Paid - Lump Sum 0.0 0.0  
Employee Transfers (4.0) 2.4  
Reclassified to Assets Held for Sale 0.0 0.0  
Fair Value of Plan Assets as of End of Year 1,144.4 1,170.0 1,172.0
Funded Status as of December 31st 161.5 121.5  
CL&P | PBOP      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation as of Beginning of Year (120.6) (127.9)  
Service Cost (1.2) (1.3) (2.0)
Interest Cost (5.6) (6.2) (3.7)
Actuarial Gain/(Loss) 8.9 4.4  
Benefits Paid 9.4 10.0  
Employee Transfers 0.0 0.0  
Reclassified to Assets Held for Sale 0.0 0.0  
Plan Amendment 0.0 0.4  
Benefit Obligation as of End of Year (109.1) (120.6) (127.9)
Change in Pension Plan Assets:      
Fair Value of Plan Assets as of Beginning of Year 123.0 120.6  
Employer Contributions 0.0 0.0  
Actual Return on Plan Assets 11.2 12.6  
Benefits Paid - Pension (9.4) (10.0)  
Employee Transfers (0.4) (0.2)  
Reclassified to Assets Held for Sale 0.0 0.0  
Fair Value of Plan Assets as of End of Year 124.4 123.0 120.6
Funded Status as of December 31st 15.3 2.4  
NSTAR Electric | Pension and SERP      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation as of Beginning of Year (1,107.0) (1,110.4)  
Service Cost (7.7) (7.8) (13.8)
Interest Cost (51.6) (53.9) (32.8)
Actuarial Gain/(Loss) 74.1 (17.6)  
Benefits Paid 67.1 76.7  
Benefits Paid - Lump Sum 7.6 5.3  
Benefits Paid - SERP 0.2 0.2  
Employee Transfers 13.8 0.5  
Reclassified to Assets Held for Sale 0.0 0.0  
Benefit Obligation as of End of Year (1,003.5) (1,107.0) (1,110.4)
Change in Pension Plan Assets:      
Fair Value of Plan Assets as of Beginning of Year 1,411.6 1,418.8  
Employer Contributions 0.0 0.0  
Actual Return on Plan Assets 55.1 75.3  
Benefits Paid - Pension (67.1) (76.7)  
Benefits Paid - Lump Sum (7.6) (5.3)  
Employee Transfers (13.8) (0.5)  
Reclassified to Assets Held for Sale 0.0 0.0  
Fair Value of Plan Assets as of End of Year 1,378.2 1,411.6 1,418.8
Funded Status as of December 31st 374.7 304.6  
NSTAR Electric | PBOP      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation as of Beginning of Year (188.3) (189.5)  
Service Cost (1.2) (1.2) (2.0)
Interest Cost (8.8) (9.2) (5.3)
Actuarial Gain/(Loss) 10.7 (5.8)  
Benefits Paid 15.9 16.7  
Employee Transfers 0.3 0.5  
Reclassified to Assets Held for Sale 0.0 0.0  
Plan Amendment 0.0 0.2  
Benefit Obligation as of End of Year (171.4) (188.3) (189.5)
Change in Pension Plan Assets:      
Fair Value of Plan Assets as of Beginning of Year 490.4 456.1  
Employer Contributions 0.0 0.0  
Actual Return on Plan Assets 45.8 52.3  
Benefits Paid - Pension (15.9) (16.7)  
Employee Transfers (1.1) (1.3)  
Reclassified to Assets Held for Sale 0.0 0.0  
Fair Value of Plan Assets as of End of Year 519.2 490.4 456.1
Funded Status as of December 31st 347.8 302.1  
PSNH | Pension and SERP      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation as of Beginning of Year (562.3) (556.2)  
Service Cost (4.3) (4.3) (6.9)
Interest Cost (26.8) (27.3) (16.9)
Actuarial Gain/(Loss) 30.7 (11.6)  
Benefits Paid 38.0 35.7  
Benefits Paid - Lump Sum 0.1 1.0  
Benefits Paid - SERP 0.4 0.4  
Employee Transfers 2.7 0.0  
Reclassified to Assets Held for Sale 0.0 0.0  
Benefit Obligation as of End of Year (521.5) (562.3) (556.2)
Change in Pension Plan Assets:      
Fair Value of Plan Assets as of Beginning of Year 614.0 618.0  
Employer Contributions 0.0 0.0  
Actual Return on Plan Assets 24.3 32.7  
Benefits Paid - Pension (38.0) (35.7)  
Benefits Paid - Lump Sum (0.1) (1.0)  
Employee Transfers (2.7) 0.0  
Reclassified to Assets Held for Sale 0.0 0.0  
Fair Value of Plan Assets as of End of Year 597.5 614.0 618.0
Funded Status as of December 31st 76.0 51.7  
PSNH | PBOP      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation as of Beginning of Year (72.0) (74.6)  
Service Cost (0.6) (0.7) (1.1)
Interest Cost (3.4) (3.7) (2.2)
Actuarial Gain/(Loss) 3.9 0.8  
Benefits Paid 6.2 6.1  
Employee Transfers 0.0 (0.1)  
Reclassified to Assets Held for Sale 0.0 0.0  
Plan Amendment 0.0 0.2  
Benefit Obligation as of End of Year (65.9) (72.0) (74.6)
Change in Pension Plan Assets:      
Fair Value of Plan Assets as of Beginning of Year 74.7 72.3  
Employer Contributions 0.0 0.0  
Actual Return on Plan Assets 7.6 8.3  
Benefits Paid - Pension (6.1) (6.1)  
Employee Transfers 0.2 0.2  
Reclassified to Assets Held for Sale 0.0 0.0  
Fair Value of Plan Assets as of End of Year 76.4 74.7 $ 72.3
Funded Status as of December 31st $ 10.5 $ 2.7