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FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | $ 155,570 | $ 155,570
Rate Reduction Bonds | 410,492 | 453,702
Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 155,600 | 155,600
Long-Term Debt | 21,044,100 | 18,216,700
Rate Reduction Bonds | 453,700 | 496,900
Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 136,700 | 166,300
Long-Term Debt | 18,891,300 | 19,636,300
Rate Reduction Bonds | 424,700 | 543,300
CL&P |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 116,200 | 116,200
CL&P | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 116,200 | 116,200
Long-Term Debt | 4,216,500 | 4,215,400
Rate Reduction Bonds | 0 | 0
CL&P | Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 99,200 | 122,300
Long-Term Debt | 3,828,300 | 4,848,900
CL&P | Fair Value | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Rate Reduction Bonds | 0 | 0
NSTAR Electric |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 43,000 | 43,000
NSTAR Electric | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 43,000 | 43,000
Long-Term Debt | 4,425,100 | 3,985,400
Rate Reduction Bonds | 0 | 0
NSTAR Electric | Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 37,500 | 44,000
Long-Term Debt | 4,091,800 | 4,453,500
NSTAR Electric | Fair Value | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Rate Reduction Bonds | 0 | 0
PSNH |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Rate Reduction Bonds | 410,492 | 453,702
PSNH | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 0 | 0
Long-Term Debt | 1,164,600 | 1,163,800
Rate Reduction Bonds | 453,700 | 496,900
PSNH | Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 0 | 0
Long-Term Debt | 970,500 | 1,220,600
Rate Reduction Bonds | $ 424,700 | $ 543,300

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