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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Increase due to CMA acquisition |  | $ 24,200 |
Allowance for uncollectible accounts for late fees and other receivable amounts | $ 417,406 | 358,851 | $ 224,800
Restatement Adjustment |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts |  | 23,800 |
The Connecticut Light and Power Company |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Period of accounts receivable recoverable under financial or medical duress | 180 days |  |
Increase due to CMA acquisition |  | 0 |
Allowance for uncollectible accounts for late fees and other receivable amounts | $ 181,319 | 157,447 | 97,300
The Connecticut Light and Power Company | Restatement Adjustment |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts |  | 22,200 |
NSTAR Electric Company |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Increase due to CMA acquisition |  | 0 |
Allowance for uncollectible accounts for late fees and other receivable amounts | 97,005 | 91,583 | 75,400
NSTAR Electric Company | Restatement Adjustment |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts |  | (1,300) |
Public Service Company of New Hampshire |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Increase due to CMA acquisition |  | 0 |
Allowance for uncollectible accounts for late fees and other receivable amounts | $ 24,331 | 17,157 | 10,500
Public Service Company of New Hampshire | Restatement Adjustment |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts |  | 300 |
Yankee Gas Services Company |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Period of accounts receivable recoverable under financial or medical duress | 90 days |  |
Allowance for Doubtful Accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 358,851 | 224,821 | 212,723
Additions, Charged to Costs and Expense | 60,886 | 53,461 | 63,446
Additions, Charged to Other Accounts | 110,572 | 145,005 | 57,223
Deductions | 112,903 | 64,436 | 108,571
Balance at end of period | 417,406 | 358,851 | 224,821
Allowance for Doubtful Accounts | The Connecticut Light and Power Company |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 157,447 | 97,348 | 88,034
Additions, Charged to Costs and Expense | 13,495 | 12,882 | 15,947
Additions, Charged to Other Accounts | 57,779 | 71,223 | 38,935
Deductions | 47,402 | 24,006 | 45,568
Balance at end of period | 181,319 | 157,447 | 97,348
Allowance for Doubtful Accounts | NSTAR Electric Company |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 91,583 | 75,406 | 74,516
Additions, Charged to Costs and Expense | 16,649 | 15,293 | 25,079
Additions, Charged to Other Accounts | 20,064 | 23,424 | 12,556
Deductions | 31,291 | 22,540 | 36,745
Balance at end of period | 97,005 | 91,583 | 75,406
Allowance for Doubtful Accounts | Public Service Company of New Hampshire |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 17,157 | 10,497 | 11,065
Additions, Charged to Costs and Expense | 13,113 | 5,164 | 6,726
Additions, Charged to Other Accounts | 3,135 | 7,692 | 872
Deductions | 9,074 | 6,196 | 8,166
Balance at end of period | $ 24,331 | $ 17,157 | $ 10,497

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