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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands, customer in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) customer regulatedUtility | Dec. 31, 2020 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Oct. 01, 2021 USD ($) | Dec. 31, 2019 USD ($)
Summary of Accounting Policies [Line Items] |  |  |  |  |  |
Number of electric and natural gas customers | customer | 4.4 |  |  |  |  |
Goodwill | $ 4,522,632 | $ 4,446,000 |  | $ 4,477,269 |  |
Allowance for uncollectible accounts for late fees and other receivable amounts | 486,297 | 358,900 |  | 417,406 |  | $ 224,800
Bill of forgiveness | 521,752 | 264,950 |  | 221,008 |  | 117,063
Cash equivalents | 374,600 |  |  | 66,800 |  |
Charitable contributions | 8,000 | 6,400 |  |  |  |
Energy Relief Fund |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |
Restricted cash, current | 20,000 |  |  |  |  |
Restricted cash, noncurrent | 15,900 |  |  |  |  |
Restricted cash |  |  |  | 41,500 |  |
Electric Transmission |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |
Goodwill | 576,800 | 576,800 |  | 576,800 |  |
Retail (Non-Hardship), Wholesale, and Other |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts | 201,900 | 164,100 |  | 191,300 |  | 81,500
CL&P |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts | $ 225,320 | 157,400 |  | 181,319 |  | 97,300
Period of accounts receivable recoverable under financial or medical duress | 180 days |  |  |  |  |
Maximum loans receivable outstanding | $ 55,000 |  |  |  |  |
Loans transferred receivable current | 9,100 |  |  | 10,500 |  |
Loans transferred receivable non-current | 13,000 |  |  | 8,300 |  |
Bill of forgiveness | 20,327 | 99,809 |  | 74,788 |  | 4,971
Cash equivalents | 11,300 |  |  | 55,800 |  |
Long term receivable | 25,000 |  |  | 25,000 |  |
CL&P | Customer Assistance Fund |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |
Bill of forgiveness |  |  | $ 10,000 |  |  |
CL&P | Unfavorable Regulatory Action |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |
Customer assistance initiatives |  |  |  |  | $ 10,000 |
CL&P | Retail (Non-Hardship), Wholesale, and Other |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts | $ 36,400 | 28,300 |  | 36,700 |  | 17,200
Yankee Gas Services Company |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |
Period of accounts receivable recoverable under financial or medical duress | 90 days |  |  |  |  |
NSTAR Electric |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts | $ 94,958 | 91,600 |  | 97,005 |  | 75,400
Bill of forgiveness | 345,293 | 17,410 |  | 18,179 |  | 6,312
Cash equivalents | 327,700 |  |  | 700 |  |
Long term receivable | 5,500 |  |  | 5,500 |  |
NSTAR Electric | Cash Infusion From Parent |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |
Cash equivalents | 327,000 |  |  |  |  |
NSTAR Electric | Retail (Non-Hardship), Wholesale, and Other |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts | 51,300 | 51,900 |  | 53,700 |  | 31,500
PSNH |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts | 29,236 | 17,200 |  | 24,331 |  | 10,500
Bill of forgiveness | 36,812 | $ 39,555 |  | 35,126 |  | $ 36,688
Cash equivalents | 100 |  |  | 0 |  |
Long term receivable | $ 3,800 |  |  | 3,800 |  |
Connecticut, Massachusetts and New Hampshire |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |
Number of regulated utilities | regulatedUtility | 12 |  |  |  |  |
COVID 19 |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts | $ 50,900 |  |  | 55,300 |  |
COVID 19 | CL&P |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts | 16,000 |  |  | 23,900 |  |
COVID 19 | NSTAR Electric |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts | $ 4,100 |  |  | $ 9,000 |  |

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