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INCOME TAXES - Reconciliation Between Income Tax Expense and Expected Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Contingency [Line Items]      
Income Before Income Tax Expense $ 1,572,269 $ 1,558,872 $ 1,190,071
Statutory Federal Income Tax Expense at 21% 330,200 327,400 249,900
Tax Effect of Differences:      
Depreciation (18,100) (11,100) 1,900
Investment Tax Credit Amortization (2,800) (3,700) (3,700)
State Income Taxes, Net of Federal Impact 54,400 44,900 24,600
Dividends on ESOP (5,100) (5,100) (5,100)
Tax Asset Valuation   Allowance/Reserve Adjustments 44,600 33,400 40,100
Excess Stock Benefit (4,000) (6,600) (1,500)
EDIT Amortization (69,100) (48,700) (37,400)
Other, Net 14,100 15,700 4,700
Income Tax Expense $ 344,223 $ 346,186 $ 273,499
Effective Tax Rate 21.90% 22.20% 23.00%
The Connecticut Light and Power Company      
Income Tax Contingency [Line Items]      
Income Before Income Tax Expense $ 532,998 $ 607,636 $ 547,823
Statutory Federal Income Tax Expense at 21% 111,900 127,600 115,000
Tax Effect of Differences:      
Depreciation (6,400) 400 (200)
Investment Tax Credit Amortization (600) (700) (800)
State Income Taxes, Net of Federal Impact (4,600) (1,200) 2,500
Tax Asset Valuation   Allowance/Reserve Adjustments 36,700 30,700 24,500
Excess Stock Benefit (1,500) (2,300) (500)
EDIT Amortization (9,800) (9,000) (5,800)
Other, Net 5,600 4,200 2,300
Income Tax Expense $ 131,273 $ 149,702 $ 136,971
Effective Tax Rate 24.60% 24.60% 25.00%
NSTAR Electric Company      
Income Tax Contingency [Line Items]      
Income Before Income Tax Expense $ 590,904 $ 575,829 $ 557,269
Statutory Federal Income Tax Expense at 21% 124,100 120,900 117,000
Tax Effect of Differences:      
Depreciation (3,400) (3,700) (3,000)
Investment Tax Credit Amortization (1,700) (2,600) (2,600)
State Income Taxes, Net of Federal Impact 37,500 36,000 35,700
Tax Asset Valuation   Allowance/Reserve Adjustments 0 0 0
Excess Stock Benefit (1,400) (2,300) (500)
EDIT Amortization (43,200) (20,400) (22,900)
Other, Net 2,400 2,900 1,600
Income Tax Expense $ 114,335 $ 130,828 $ 125,313
Effective Tax Rate 19.30% 22.70% 22.50%
Public Service Company of New Hampshire      
Income Tax Contingency [Line Items]      
Income Before Income Tax Expense $ 189,771 $ 178,992 $ 175,023
Statutory Federal Income Tax Expense at 21% 39,900 37,600 36,800
Tax Effect of Differences:      
Depreciation (200) (1,400) (800)
Investment Tax Credit Amortization 0 0 0
State Income Taxes, Net of Federal Impact 8,900 9,800 9,800
Tax Asset Valuation   Allowance/Reserve Adjustments 0 0 0
Excess Stock Benefit (500) (800) (200)
EDIT Amortization (10,500) (15,400) (4,000)
Other, Net 1,800 1,900 (600)
Income Tax Expense $ 39,433 $ 31,680 $ 40,975
Effective Tax Rate 20.80% 17.70% 23.40%