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INCOME TAXES - Temporary Differences That Give Rise To Accumulated Deferred Income Tax Obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Deferred Tax Assets:    
Employee Benefits $ 266.9 $ 244.5
Derivative Liabilities 19.6 33.0
Regulatory Deferrals - Liabilities 508.7 452.0
Allowance for Uncollectible Accounts 145.3 143.8
Tax Effect - Tax Regulatory Liabilities 720.8 739.0
Net Operating Loss Carryforwards 198.2 13.8
Purchase Accounting Adjustment 52.1 56.7
Equity Method Wind Investments 1,098.6 584.9
Other 267.1 200.1
Total Deferred Tax Assets 3,277.3 2,467.8
Less: Valuation Allowance 558.2 328.1
Net Deferred Tax Assets 2,719.1 2,139.7
Deferred Tax Liabilities:    
Accelerated Depreciation and Other   Plant-Related Differences 5,493.3 5,103.3
Property Tax Accruals 107.4 95.0
Regulatory Amounts:    
Regulatory Deferrals - Assets 1,709.1 1,512.3
Tax Effect - Tax Regulatory Assets 294.5 284.0
Goodwill-related Regulatory Asset - 1999 Merger 67.5 72.2
Employee Benefits 353.0 282.0
Derivative Assets 3.8 6.4
Other 101.7 88.2
Total Deferred Tax Liabilities 8,130.3 7,443.4
Offshore Wind Business    
Regulatory Amounts:    
Impairment charge 427.0 224.0
CL&P    
Deferred Tax Assets:    
Employee Benefits 33.7 29.9
Derivative Liabilities 19.6 33.0
Regulatory Deferrals - Liabilities 128.0 94.4
Allowance for Uncollectible Accounts 75.4 79.6
Tax Effect - Tax Regulatory Liabilities 317.6 320.7
Net Operating Loss Carryforwards 0.0 0.0
Purchase Accounting Adjustment 0.0 0.0
Equity Method Wind Investments 0.0 0.0
Other 134.7 125.3
Total Deferred Tax Assets 709.0 682.9
Less: Valuation Allowance 104.1 80.6
Net Deferred Tax Assets 604.9 602.3
Deferred Tax Liabilities:    
Accelerated Depreciation and Other   Plant-Related Differences 1,820.3 1,703.4
Property Tax Accruals 49.8 42.0
Regulatory Amounts:    
Regulatory Deferrals - Assets 522.9 470.0
Tax Effect - Tax Regulatory Assets 194.7 191.9
Goodwill-related Regulatory Asset - 1999 Merger 0.0 0.0
Employee Benefits 51.0 38.8
Derivative Assets 3.8 6.4
Other 15.2 9.9
Total Deferred Tax Liabilities 2,657.7 2,462.4
NSTAR Electric    
Deferred Tax Assets:    
Employee Benefits 83.5 66.8
Derivative Liabilities 0.0 0.0
Regulatory Deferrals - Liabilities 316.7 291.5
Allowance for Uncollectible Accounts 26.5 21.5
Tax Effect - Tax Regulatory Liabilities 214.3 227.1
Net Operating Loss Carryforwards 0.0 0.0
Purchase Accounting Adjustment 0.0 0.0
Equity Method Wind Investments 0.0 0.0
Other 31.5 25.0
Total Deferred Tax Assets 672.5 631.9
Less: Valuation Allowance 0.0 0.0
Net Deferred Tax Assets 672.5 631.9
Deferred Tax Liabilities:    
Accelerated Depreciation and Other   Plant-Related Differences 1,845.2 1,728.6
Property Tax Accruals 44.5 39.8
Regulatory Amounts:    
Regulatory Deferrals - Assets 519.9 474.5
Tax Effect - Tax Regulatory Assets 10.0 10.5
Goodwill-related Regulatory Asset - 1999 Merger 58.0 61.9
Employee Benefits 175.4 146.7
Derivative Assets 0.0 0.0
Other 24.9 19.5
Total Deferred Tax Liabilities 2,677.9 2,481.5
PSNH    
Deferred Tax Assets:    
Employee Benefits 14.5 13.0
Derivative Liabilities 0.0 0.0
Regulatory Deferrals - Liabilities 19.6 23.8
Allowance for Uncollectible Accounts 3.8 3.9
Tax Effect - Tax Regulatory Liabilities 93.2 95.5
Net Operating Loss Carryforwards 1.5 0.0
Purchase Accounting Adjustment 0.0 0.0
Equity Method Wind Investments 0.0 0.0
Other 24.1 23.4
Total Deferred Tax Assets 156.7 159.6
Less: Valuation Allowance 0.0 0.0
Net Deferred Tax Assets 156.7 159.6
Deferred Tax Liabilities:    
Accelerated Depreciation and Other   Plant-Related Differences 618.4 566.5
Property Tax Accruals 6.5 6.3
Regulatory Amounts:    
Regulatory Deferrals - Assets 277.8 250.3
Tax Effect - Tax Regulatory Assets 9.4 8.3
Goodwill-related Regulatory Asset - 1999 Merger 0.0 0.0
Employee Benefits 23.5 16.8
Derivative Assets 0.0 0.0
Other 2.7 2.9
Total Deferred Tax Liabilities $ 938.3 $ 851.1