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REGULATORY ACCOUNTING - Components of Regulatory Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | $ 5,715,800 | $ 6,569,900
Less: Current Portion | 1,129,093 | 1,076,556
Total Long-Term Regulatory Assets | 4,586,709 | 5,493,330
Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,481,000 | 2,794,200
Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 790,700 | 747,100
Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 478,900 | 522,100
Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,102,700 | 765,600
Regulatory Tracker Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,050,500 | 850,500
Derivative Liabilities |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 249,200 | 296,300
Goodwill-related |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 297,800 | 314,700
Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 115,000 | 118,400
Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 150,000 | 161,000
The Connecticut Light and Power Company |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 2,084,800 | 2,211,800
Less: Current Portion | 371,609 | 345,622
Total Long-Term Regulatory Assets | 1,713,161 | 1,866,152
The Connecticut Light and Power Company | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 272,400 | 632,300
The Connecticut Light and Power Company | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 470,500 | 458,900
The Connecticut Light and Power Company | Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
The Connecticut Light and Power Company | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 695,600 | 515,100
The Connecticut Light and Power Company | Regulatory Tracker Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 333,600 | 246,600
The Connecticut Light and Power Company | Derivative Liabilities |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 249,200 | 293,100
The Connecticut Light and Power Company | Goodwill-related |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
The Connecticut Light and Power Company | Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 33,600 | 32,100
The Connecticut Light and Power Company | Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 29,900 | 33,700
NSTAR Electric Company |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,579,200 | 1,703,900
Less: Current Portion | 443,956 | 399,882
Total Long-Term Regulatory Assets | 1,135,231 | 1,304,019
NSTAR Electric Company | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 395,500 | 690,000
NSTAR Electric Company | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 112,600 | 110,400
NSTAR Electric Company | Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
NSTAR Electric Company | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 341,300 | 186,400
NSTAR Electric Company | Regulatory Tracker Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 376,600 | 332,200
NSTAR Electric Company | Derivative Liabilities |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
NSTAR Electric Company | Goodwill-related |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 255,700 | 270,200
NSTAR Electric Company | Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 59,800 | 58,600
NSTAR Electric Company | Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 37,700 | 56,100
Public Service Company of New Hampshire |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 786,400 | 989,100
Less: Current Portion | 107,169 | 115,852
Total Long-Term Regulatory Assets | 679,182 | 873,203
Public Service Company of New Hampshire | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 118,900 | 267,600
Public Service Company of New Hampshire | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 17,500 | 15,200
Public Service Company of New Hampshire | Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 478,900 | 522,100
Public Service Company of New Hampshire | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 65,800 | 64,100
Public Service Company of New Hampshire | Regulatory Tracker Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 85,400 | 95,300
Public Service Company of New Hampshire | Derivative Liabilities |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
Public Service Company of New Hampshire | Goodwill-related |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
Public Service Company of New Hampshire | Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 4,100 | 3,900
Public Service Company of New Hampshire | Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | $ 15,800 | $ 20,900

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