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REGULATORY ACCOUNTING - Components of Regulatory Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | $ 5,739,900 | $ 5,578,300
Less: Current Portion | 1,332,028 | 1,335,491
Total Long-Term Regulatory Assets | 4,407,875 | 4,242,794
Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,658,700 | 1,379,100
Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,028,700 | 1,075,300
Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 910,300 | 921,700
Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 856,100 | 853,300
Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 424,900 | 435,700
Goodwill-related |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 276,700 | 281,000
Derivative Liabilities |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 168,800 | 181,800
Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 129,200 | 127,900
Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 286,500 | 322,500
CL&P |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,996,500 | 1,907,800
Less: Current Portion | 356,468 | 314,089
Total Long-Term Regulatory Assets | 1,639,960 | 1,593,693
CL&P | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 889,200 | 799,300
CL&P | Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 228,200 | 216,800
CL&P | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 155,600 | 156,700
CL&P | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 492,900 | 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 | 168,800 | 181,800
CL&P | Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 36,500 | 35,900
CL&P | Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 25,300 | 26,200
NSTAR Electric |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,823,300 | 1,714,400
Less: Current Portion | 559,758 | 492,759
Total Long-Term Regulatory Assets | 1,263,534 | 1,221,619
NSTAR Electric | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 564,900 | 484,400
NSTAR Electric | Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 432,400 | 391,500
NSTAR Electric | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 294,400 | 299,500
NSTAR Electric | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 118,100 | 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 | 237,600 | 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 | 68,000 | 68,200
NSTAR Electric | Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 107,900 | 114,000
PSNH |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 838,500 | 696,200
Less: Current Portion | 140,912 | 102,240
Total Long-Term Regulatory Assets | 697,568 | 593,974
PSNH | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 204,600 | 95,400
PSNH | Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 122,800 | 73,700
PSNH | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 56,100 | 56,600
PSNH | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 13,100 | 16,000
PSNH | Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 424,900 | 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 | $ 12,500 | $ 14,400

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