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EMPLOYEE BENEFITS - Schedule of Pension Benefit Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension and SERP      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation as of Beginning of Year $ (6,729.7) $ (7,045.3)  
Service Cost (70.1) (85.8) $ (76.2)
Interest Cost (154.5) (130.0) (177.8)
Actuarial Gain 1,385.8 177.1  
Benefits Paid 302.5 309.5  
Benefits Paid - Lump Sum 33.0 34.7  
Benefits Paid - SERP 12.9 10.1  
Employee Transfers 0.0 0.0  
Benefit Obligation as of End of Year (5,220.1) (6,729.7) (7,045.3)
Change in Pension Plan Assets:      
Fair Value of Plan Assets as of Beginning of Year 6,495.5 5,409.2  
Actual Return on Plan Assets (433.6) 1,250.5  
Employer Contributions 80.0 180.0  
Benefits Paid - Pension (302.5) (309.5)  
Benefits Paid - Lump Sum (33.0) (34.7)  
Employee Transfers 0.0 0.0  
Fair Value of Plan Assets as of End of Year 5,806.4 6,495.5 5,409.2
Funded Status as of December 31st 586.3 (234.2)  
PBOP      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation as of Beginning of Year (884.3) (993.9)  
Service Cost (11.6) (13.5) (10.2)
Interest Cost (20.2) (17.4) (24.6)
Actuarial Gain 173.6 81.4  
Benefits Paid 52.1 51.7  
Employee Transfers 0.0 0.0  
Impact of Acquisitions (3.3) 7.4  
Benefit Obligation as of End of Year (693.7) (884.3) (993.9)
Change in Pension Plan Assets:      
Fair Value of Plan Assets as of Beginning of Year 1,138.3 1,004.1  
Actual Return on Plan Assets (119.6) 183.2  
Employer Contributions 3.1 2.3  
Benefits Paid - Pension (51.7) (51.3)  
Employee Transfers 0.0 0.0  
Fair Value of Plan Assets as of End of Year 970.1 1,138.3 1,004.1
Funded Status as of December 31st 276.4 254.0  
CL&P | Pension and SERP      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation as of Beginning of Year (1,330.9) (1,477.3)  
Service Cost (18.7) (23.0) (21.8)
Interest Cost (31.3) (27.3) (37.3)
Actuarial Gain 284.1 127.8  
Benefits Paid 63.3 64.6  
Benefits Paid - Lump Sum 0.0 0.0  
Benefits Paid - SERP 0.3 0.3  
Employee Transfers 3.2 4.0  
Benefit Obligation as of End of Year (1,030.0) (1,330.9) (1,477.3)
Change in Pension Plan Assets:      
Fair Value of Plan Assets as of Beginning of Year 1,323.8 1,043.1  
Actual Return on Plan Assets (85.3) 250.4  
Employer Contributions 0.0 98.9  
Benefits Paid - Pension (63.3) (64.6)  
Benefits Paid - Lump Sum 0.0 0.0  
Employee Transfers (3.2) (4.0)  
Fair Value of Plan Assets as of End of Year 1,172.0 1,323.8 1,043.1
Funded Status as of December 31st 142.0 (7.1)  
CL&P | PBOP      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation as of Beginning of Year (165.5) (178.6)  
Service Cost (2.0) (2.3) (1.7)
Interest Cost (3.7) (3.2) (4.4)
Actuarial Gain 33.0 5.8  
Benefits Paid 10.4 10.9  
Employee Transfers (0.1) 1.9  
Impact of Acquisitions 0.0 0.0  
Benefit Obligation as of End of Year (127.9) (165.5) (178.6)
Change in Pension Plan Assets:      
Fair Value of Plan Assets as of Beginning of Year 145.7 134.1  
Actual Return on Plan Assets (15.0) 24.1  
Employer Contributions 0.0 0.0  
Benefits Paid - Pension (10.4) (10.9)  
Employee Transfers 0.3 (1.6)  
Fair Value of Plan Assets as of End of Year 120.6 145.7 134.1
Funded Status as of December 31st (7.3) (19.8)  
NSTAR Electric | Pension and SERP      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation as of Beginning of Year (1,448.4) (1,517.9)  
Service Cost (13.8) (15.8) (15.4)
Interest Cost (32.8) (26.8) (38.6)
Actuarial Gain 295.5 20.8  
Benefits Paid 68.4 68.7  
Benefits Paid - Lump Sum 14.8 15.6  
Benefits Paid - SERP 0.2 0.2  
Employee Transfers 5.7 6.8  
Benefit Obligation as of End of Year (1,110.4) (1,448.4) (1,517.9)
Change in Pension Plan Assets:      
Fair Value of Plan Assets as of Beginning of Year 1,596.0 1,345.1  
Actual Return on Plan Assets (103.3) 312.0  
Employer Contributions 15.0 30.0  
Benefits Paid - Pension (68.4) (68.7)  
Benefits Paid - Lump Sum (14.8) (15.6)  
Employee Transfers (5.7) (6.8)  
Fair Value of Plan Assets as of End of Year 1,418.8 1,596.0 1,345.1
Funded Status as of December 31st 308.4 147.6  
NSTAR Electric | PBOP      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation as of Beginning of Year (238.4) (260.5)  
Service Cost (2.0) (2.4) (2.1)
Interest Cost (5.3) (4.4) (6.6)
Actuarial Gain 39.4 11.5  
Benefits Paid 16.6 16.3  
Employee Transfers 0.2 1.1  
Impact of Acquisitions 0.0 0.0  
Benefit Obligation as of End of Year (189.5) (238.4) (260.5)
Change in Pension Plan Assets:      
Fair Value of Plan Assets as of Beginning of Year 530.0 464.6  
Actual Return on Plan Assets (57.0) 84.2  
Employer Contributions 0.0 0.0  
Benefits Paid - Pension (16.6) (16.3)  
Employee Transfers (0.3) (2.5)  
Fair Value of Plan Assets as of End of Year 456.1 530.0 464.6
Funded Status as of December 31st 266.6 291.6  
PSNH | Pension and SERP      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation as of Beginning of Year (721.0) (748.7)  
Service Cost (6.9) (8.9) (8.2)
Interest Cost (16.9) (14.5) (19.4)
Actuarial Gain 156.7 14.7  
Benefits Paid 33.9 34.7  
Benefits Paid - Lump Sum 1.0 0.0  
Benefits Paid - SERP 0.4 0.4  
Employee Transfers (3.4) 1.3  
Benefit Obligation as of End of Year (556.2) (721.0) (748.7)
Change in Pension Plan Assets:      
Fair Value of Plan Assets as of Beginning of Year 694.6 593.7  
Actual Return on Plan Assets (45.1) 136.9  
Employer Contributions 0.0 0.0  
Benefits Paid - Pension (33.9) (34.7)  
Benefits Paid - Lump Sum (1.0) 0.0  
Employee Transfers 3.4 (1.3)  
Fair Value of Plan Assets as of End of Year 618.0 694.6 593.7
Funded Status as of December 31st 61.8 (26.4)  
PSNH | PBOP      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation as of Beginning of Year (92.3) (109.5)  
Service Cost (1.1) (1.2) (0.9)
Interest Cost (2.2) (1.8) (2.8)
Actuarial Gain 15.2 14.6  
Benefits Paid 6.0 5.6  
Employee Transfers (0.2) 0.0  
Impact of Acquisitions 0.0 0.0  
Benefit Obligation as of End of Year (74.6) (92.3) (109.5)
Change in Pension Plan Assets:      
Fair Value of Plan Assets as of Beginning of Year 88.0 79.4  
Actual Return on Plan Assets (9.8) 14.2  
Employer Contributions 0.0 0.0  
Benefits Paid - Pension (6.0) (5.6)  
Employee Transfers 0.1 0.0  
Fair Value of Plan Assets as of End of Year 72.3 88.0 $ 79.4
Funded Status as of December 31st $ (2.3) $ (4.3)