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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 3 Months Ended
Mar. 31, 2022
Accounting Policies [Abstract]  
Allowance for Uncollectible Accounts The activity in the allowance for uncollectible accounts by portfolio segment as of March 31st is as follows:
EversourceCL&PNSTAR ElectricPSNH
(Millions of Dollars)Hardship AccountsRetail (Non-Hardship),
Wholesale, and Other		Total AllowanceHardship AccountsRetail (Non-Hardship),
Wholesale, and Other		Total AllowanceHardship AccountsRetail (Non-Hardship),
Wholesale, and Other		Total AllowanceTotal Allowance
Three Months Ended 2022
Beginning Balance$226.1 $191.3 $417.4 $144.6 $36.7 $181.3 $43.3 $53.7 $97.0 $24.3 
Uncollectible Expense— 17.1 17.1 — 3.8 3.8 — 4.7 4.7 2.5 
Uncollectible Costs Deferred (1)
0.9 14.8 15.7 (4.0)(2.1)(6.1)(3.3)5.4 2.1 1.0 
Write-Offs(2.3)(22.0)(24.3)(1.1)(0.5)(1.6)(0.3)(10.6)(10.9)(1.8)
Recoveries Collected0.8 5.5 6.3 0.6 2.5 3.1 — 1.9 1.9 0.2 
Ending Balance$225.5 $206.7 $432.2 $140.1 $40.4 $180.5 $39.7 $55.1 $94.8 $26.2 
Three Months Ended 2021
Beginning Balance$194.8 $164.1 $358.9 $129.1 $28.3 $157.4 $39.7 $51.9 $91.6 $17.2 
Uncollectible Expense— 16.3 16.3 — 3.8 3.8 — 3.9 3.9 1.2 
Uncollectible Costs Deferred (1)
5.4 27.1 32.5 11.9 7.5 19.4 (8.5)8.4 (0.1)1.2 
Write-Offs(3.3)(16.7)(20.0)(2.9)(4.0)(6.9)(0.1)(7.5)(7.6)(2.5)
Recoveries Collected0.4 3.6 4.0 0.3 1.1 1.4 — 1.5 1.5 0.2 
Ending Balance$197.3 $194.4 $391.7 $138.4 $36.7 $175.1 $31.1 $58.2 $89.3 $17.3 
(1) These expected credit losses are deferred as regulatory costs on the balance sheets, as these amounts are ultimately recovered in rates. Amounts include uncollectible costs for hardship accounts and other customer receivables, including uncollectible amounts related to uncollectible energy supply costs and COVID-19.
Components of Other Income, Net
The components of Other Income, Net on the statements of income were as follows:
 For the Three Months Ended
 March 31, 2022March 31, 2021
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
Pension, SERP and PBOP Non-Service
   Income Components		$54.3 $15.9 $21.0 $6.6 $20.1 $2.7 $10.1 $2.7 
AFUDC Equity9.9 2.8 4.9 0.4 9.2 1.7 6.2 0.6 
Equity in Earnings of Unconsolidated Affiliates0.4 — — — 3.7 — 0.1 — 
Investment (Loss)/Income(0.2)(0.4)(0.3)0.2 (0.6)0.4 0.2 0.1 
Interest Income6.7 1.3 3.5 0.3 1.5 0.1 0.1 0.7 
Other0.5 — 0.1 — 0.3 — 0.1 0.1 
Total Other Income, Net$71.6 $19.6 $29.2 $7.5 $34.2 $4.9 $16.8 $4.2 
Other Taxes These gross receipts taxes are recorded separately with collections in Operating Revenues and with payments in Taxes Other Than Income Taxes on the statements of income as follows:
 For the Three Months Ended
(Millions of Dollars)March 31, 2022March 31, 2021
Eversource$48.6 $48.6 
CL&P37.8 39.2 
Non-cash Investing Activities
Non-cash investing activities include plant additions included in Accounts Payable as follows:
(Millions of Dollars)As of March 31, 2022As of March 31, 2021
Eversource$385.6 $262.9 
CL&P102.1 70.9 
NSTAR Electric85.8 68.2 
PSNH49.5 23.5 
Reconciliation of Cash Balances to Cash and Restricted Cash The following table reconciles cash as reported on the balance sheets to the cash and restricted cash balance as reported on the statements of cash flows:
 As of March 31, 2022As of December 31, 2021
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
Cash as reported on the Balance Sheets$46.2 $21.6 $0.7 $3.8 $66.8 $55.8 $0.7 $— 
Restricted cash included in:
Special Deposits73.3 8.7 17.3 16.6 78.2 18.7 17.4 31.4 
Marketable Securities26.0 0.3 0.1 0.5 31.3 0.3 0.1 0.5 
Other Long-Term Assets19.1 — — 3.2 44.7 — — 3.2 
Cash and Restricted Cash as reported on the
    Statements of Cash Flows
$164.6 $30.6 $18.1 $24.1 $221.0 $74.8 $18.2 $35.1