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REGULATORY ACCOUNTING - Components of Regulatory Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | $ 5,773,000 | $ 5,578,300
Less: Current Portion | 1,382,150 | 1,335,491
Total Long-Term Regulatory Assets | 4,390,816 | 4,242,794
Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,680,700 | 1,379,100
Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,075,700 | 1,075,300
Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 873,900 | 921,700
Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 864,700 | 853,300
Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 414,100 | 435,700
Goodwill-related |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 272,500 | 281,000
Derivative Liabilities |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 152,100 | 181,800
Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 132,100 | 127,900
Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 307,200 | 322,500
CL&P |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 2,019,300 | 1,907,800
Less: Current Portion | 417,824 | 314,089
Total Long-Term Regulatory Assets | 1,601,540 | 1,593,693
CL&P | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 875,200 | 799,300
CL&P | Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 286,600 | 216,800
CL&P | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 144,100 | 156,700
CL&P | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 499,800 | 491,100
CL&P | Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
CL&P | Goodwill-related |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
CL&P | Derivative Liabilities |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 152,100 | 181,800
CL&P | Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 37,100 | 35,900
CL&P | Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 24,400 | 26,200
NSTAR Electric |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,800,200 | 1,714,400
Less: Current Portion | 569,697 | 492,759
Total Long-Term Regulatory Assets | 1,230,486 | 1,221,619
NSTAR Electric | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 552,900 | 484,400
NSTAR Electric | Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 438,300 | 391,500
NSTAR Electric | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 282,200 | 299,500
NSTAR Electric | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 121,700 | 115,600
NSTAR Electric | Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
NSTAR Electric | Goodwill-related |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 234,000 | 241,200
NSTAR Electric | Derivative Liabilities |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
NSTAR Electric | Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 69,400 | 68,200
NSTAR Electric | Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 101,700 | 114,000
PSNH |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 883,600 | 696,200
Less: Current Portion | 152,019 | 102,240
Total Long-Term Regulatory Assets | 731,621 | 593,974
PSNH | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 252,600 | 95,400
PSNH | Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 136,900 | 73,700
PSNH | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 52,300 | 56,600
PSNH | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 12,700 | 16,000
PSNH | Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 414,100 | 435,700
PSNH | Goodwill-related |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
PSNH | Derivative Liabilities |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
PSNH | Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 4,500 | 4,400
PSNH | Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | $ 10,500 | $ 14,400

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