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REGULATORY ACCOUNTING - Components of Regulatory Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | $ 5,578,300 | $ 5,715,800
Less: Current Portion | 1,335,491 | 1,129,093
Total Long-Term Regulatory Assets | 4,242,794 | 4,586,709
Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 921,700 | 1,481,000
Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,379,100 | 1,102,700
Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,075,300 | 1,050,500
Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 853,300 | 790,700
Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 435,700 | 478,900
Goodwill-related |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 281,000 | 297,800
Derivative Liabilities |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 181,800 | 249,200
Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 127,900 | 115,000
Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 322,500 | 150,000
CL&P |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,907,800 | 2,084,800
Less: Current Portion | 314,089 | 371,609
Total Long-Term Regulatory Assets | 1,593,693 | 1,713,161
CL&P | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 156,700 | 272,400
CL&P | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 799,300 | 695,600
CL&P | Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 216,800 | 333,600
CL&P | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 491,100 | 470,500
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 | 181,800 | 249,200
CL&P | Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 35,900 | 33,600
CL&P | Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 26,200 | 29,900
NSTAR Electric |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,714,400 | 1,579,200
Less: Current Portion | 492,759 | 443,956
Total Long-Term Regulatory Assets | 1,221,619 | 1,135,231
NSTAR Electric | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 299,500 | 395,500
NSTAR Electric | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 484,400 | 341,300
NSTAR Electric | Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 391,500 | 376,600
NSTAR Electric | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 115,600 | 112,600
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 | 241,200 | 255,700
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 | 68,200 | 59,800
NSTAR Electric | Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 114,000 | 37,700
PSNH |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 696,200 | 786,400
Less: Current Portion | 102,240 | 107,169
Total Long-Term Regulatory Assets | 593,974 | 679,182
PSNH | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 56,600 | 118,900
PSNH | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 95,400 | 65,800
PSNH | Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 73,700 | 85,400
PSNH | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 16,000 | 17,500
PSNH | Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 435,700 | 478,900
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 | 4,400 | 4,100
PSNH | Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | $ 14,400 | $ 15,800

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