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REGULATORY ACCOUNTING (Tables)
 9 Months Ended
Sep. 30, 2023
Regulated Operations [Abstract]  
Components of Regulatory Assets The components of regulatory assets were as follows:
 As of September 30, 2023As of December 31, 2022
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Storm Costs, Net$1,700.6 $882.7 $553.9 $264.0 $1,379.1 $799.3 $484.4 $95.4 
Regulatory Tracking Mechanisms1,173.3 254.3 473.4 166.1 1,075.3 216.8 391.5 73.7 
Benefit Costs863.4 143.2 278.0 51.8 921.7 156.7 299.5 56.6 
Income Taxes, Net879.6 504.5 125.7 17.6 853.3 491.1 115.6 16.0 
Securitized Stranded Costs403.3 — — 403.3 435.7 — — 435.7 
Goodwill-related268.3 — 230.4 — 281.0 — 241.2 — 
Derivative Liabilities136.6 136.6 — — 181.8 181.8 — — 
Asset Retirement Obligations135.0 37.8 70.9 4.7 127.9 35.9 68.2 4.4 
Other Regulatory Assets296.5 23.5 96.3 9.0 322.5 26.2 114.0 14.4 
Total Regulatory Assets5,856.6 1,982.6 1,828.6 916.5 5,578.3 1,907.8 1,714.4 696.2 
Less:  Current Portion1,507.9 383.7 638.5 177.1 1,335.5 314.1 492.8 102.2 
Total Long-Term Regulatory Assets$4,348.7 $1,598.9 $1,190.1 $739.4 $4,242.8 $1,593.7 $1,221.6 $594.0 
Components of Regulatory Liabilities The components of regulatory liabilities were as follows:
 As of September 30, 2023As of December 31, 2022
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
EDIT due to Tax Cuts and Jobs Act of 2017$2,568.6 $973.4 $915.2 $341.6 $2,619.3 $983.6 $944.3 $348.6 
Cost of Removal680.8 154.9 418.3 16.0 670.6 130.8 405.3 14.7 
Regulatory Tracking Mechanisms740.5 205.4 345.2 108.4 890.8 361.0 336.1 155.0 
Deferred Portion of Non-Service Income
   Components of Pension, SERP and PBOP		333.4 46.1 166.8 34.7 270.9 34.5 139.7 28.8 
AFUDC - Transmission117.6 53.5 64.1 — 98.2 48.2 50.0 — 
Benefit Costs43.9 0.5 21.4 — 55.4 0.7 31.4 — 
Other Regulatory Liabilities261.4 30.4 72.6 4.9 215.9 40.6 14.5 6.5 
Total Regulatory Liabilities4,746.2 1,464.2 2,003.6 505.6 4,821.1 1,599.4 1,921.3 553.6 
Less:  Current Portion724.4 155.9 416.0 114.6 890.8 336.0 373.2 162.0 
Total Long-Term Regulatory Liabilities$4,021.8 $1,308.3 $1,587.6 $391.0 $3,930.3 $1,263.4 $1,548.1 $391.6