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RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Summary of the Impact of Funding on the Balance Sheets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | $ 6,475,200 | $ 6,569,900
Regulatory Liabilities | 3,907,582 | 3,850,781
Accrued Interest (included in Other Current Liabilities) | 802,831 | 809,214
Rate Reduction Bonds - Current Portion | 43,210 | 43,210
Rate Reduction Bonds - Long-Term Portion | 453,702 | 496,912
Securitized Stranded Costs |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 489,700 | 522,100
Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 146,900 | 161,000
Current Derivative Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 55,500 | 73,600
Other Long-Term Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 44,700 | 43,600
PSNH |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 927,700 | 989,100
Regulatory Liabilities | 389,426 | 383,183
Accrued Interest (included in Other Current Liabilities) | 61,883 | 58,487
Rate Reduction Bonds - Current Portion | 43,210 | 43,210
Rate Reduction Bonds - Long-Term Portion | 453,702 | 496,912
PSNH | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Rate Reduction Bonds - Current Portion | 43,200 | 43,200
Rate Reduction Bonds - Long-Term Portion | 453,700 | 496,900
PSNH | Securitized Stranded Costs |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 489,700 | 522,100
PSNH | Securitized Stranded Costs | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 489,700 | 522,100
PSNH | Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 16,900 | 20,900
PSNH | Other Regulatory Assets | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Regulatory Liabilities | 8,000 | 9,100
Accrued Interest (included in Other Current Liabilities) | 3,000 | 8,000
PSNH | Current Derivative Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 18,600 | 36,800
PSNH | Current Derivative Assets | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 18,300 | 36,800
PSNH | Other Long-Term Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 3,200 | 2,100
PSNH | Other Long-Term Assets | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | $ 3,200 | $ 2,100

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