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REGULATORY ACCOUNTING - Components of Regulatory Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | $ 5,701,400 | $ 5,715,800
Less: Current Portion | 1,128,088 | 1,129,093
Total Long-Term Regulatory Assets | 4,573,309 | 4,586,709
Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,452,500 | 1,481,000
Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,249,300 | 1,102,700
Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 937,700 | 1,050,500
Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 791,200 | 790,700
Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 468,100 | 478,900
Goodwill-related |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 293,600 | 297,800
Derivative Liabilities |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 229,400 | 249,200
Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 117,500 | 115,000
Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 162,100 | 150,000
CL&P |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 2,063,200 | 2,084,800
Less: Current Portion | 382,112 | 371,609
Total Long-Term Regulatory Assets | 1,681,057 | 1,713,161
CL&P | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 268,000 | 272,400
CL&P | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 735,700 | 695,600
CL&P | Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 295,200 | 333,600
CL&P | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 471,800 | 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 | 229,400 | 249,200
CL&P | Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 34,200 | 33,600
CL&P | Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 28,900 | 29,900
NSTAR Electric |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,673,500 | 1,579,200
Less: Current Portion | 433,653 | 443,956
Total Long-Term Regulatory Assets | 1,239,773 | 1,135,231
NSTAR Electric | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 386,900 | 395,500
NSTAR Electric | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 449,400 | 341,300
NSTAR Electric | Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 375,000 | 376,600
NSTAR Electric | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 112,800 | 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 | 252,100 | 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 | 61,900 | 59,800
NSTAR Electric | Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 35,400 | 37,700
PSNH |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 779,200 | 786,400
Less: Current Portion | 124,701 | 107,169
Total Long-Term Regulatory Assets | 654,507 | 679,182
PSNH | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 116,500 | 118,900
PSNH | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 64,200 | 65,800
PSNH | Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 97,000 | 85,400
PSNH | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 14,500 | 17,500
PSNH | Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 468,100 | 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 | 4,200 | 4,100
PSNH | Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | $ 14,700 | $ 15,800

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