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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands | Sep. 30, 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 | 21,442,400 | 18,216,700
Rate Reduction Bonds | 453,700 | 496,900
Fair Value | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 146,000 | 166,300
Long-Term Debt | 19,010,300 | 19,636,300
Rate Reduction Bonds | 429,500 | 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 | 4,216,200 | 4,215,400
Rate Reduction Bonds | 0 | 0
CL&P | Fair Value | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 107,400 | 122,300
Long-Term Debt | 3,774,900 | 4,848,900
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 | 4,824,800 | 3,985,400
Rate Reduction Bonds | 0 | 0
NSTAR Electric | Fair Value | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 38,600 | 44,000
Long-Term Debt | 4,415,100 | 4,453,500
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 | 1,164,400 | 1,163,800
Rate Reduction Bonds | 453,700 | 496,900
PSNH | Fair Value | Level 2 |  |
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 | 960,100 | 1,220,600
Rate Reduction Bonds | $ 429,500 | $ 543,300

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