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SHORT-TERM AND LONG-TERM DEBT (Tables) | 9 Months Ended
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Sep. 30, 2022
Debt Disclosure [Abstract] |
Borrowings Outstanding and Available under the Commercial Paper Programs | The amount of borrowings outstanding and available under the commercial paper programs were as follows:
| Borrowings Outstanding as of |  | Available Borrowing Capacity as of |  | Weighted-Average Interest Rate as of
| September 30, 2022 |  | December 31, 2021 |  | September 30, 2022 |  | December 31, 2021 |  | September 30, 2022 |  | December 31, 2021
(Millions of Dollars) |  |  |  |  |
Eversource Parent Commercial Paper Program | $ | 401.5 |  |  | $ | 1,343.0 |  |  | $ | 1,598.5 |  |  | $ | 657.0 |  |  | 3.34 | % |  | 0.31 | %
NSTAR Electric Commercial Paper Program | — |  |  | 162.5 |  |  | 650.0 |  |  | 487.5 |  |  | — | % |  | 0.14 | %
Summary of Long-Term Debt Issuance and Repayments | The following table summarizes long-term debt issuances and repayments:
(Millions of Dollars) | Issuance/(Repayment) |  | Issue Date or Repayment Date |  | Maturity Date |  | Use of Proceeds for Issuance/ Repayment Information
NSTAR Electric 4.55% 2022 Debentures | $ | 450.0 |  |  | May 2022 |  | June 2052 |  | Repaid short-term debt, paid capital expenditures and working capital
NSTAR Electric 4.95% 2022 Debentures | 400.0 |  |  | September 2022 |  | September 2052 |  | Refinanced investments in eligible green expenditures, which were previously financed using short-term debt from October 1, 2020 through June 30, 2022
NSTAR Electric 2.375% 2012 Debentures | (400.0) |  |  | October 2022 |  | October 2022 |  | Paid at maturity
Eversource Parent 2.90% Series V Senior Notes | 650.0 |  |  | February 2022 |  | March 2027 |  | Repaid Series K Senior Notes at maturity and short-term debt
Eversource Parent 3.375% Series W Senior Notes | 650.0 |  |  | February 2022 |  | March 2032 |  | Repaid Series K Senior Notes at maturity and short-term debt
Eversource Parent 4.20% Series X Senior Notes | 900.0 |  |  | June 2022 |  | June 2024 |  | Repaid short-term debt and paid working capital
Eversource Parent 4.60% Series Y Senior Notes | 600.0 |  |  | June 2022 |  | July 2027 |  | Repaid short-term debt and paid working capital
Eversource Parent 2.75% Series K Senior Notes | (750.0) |  |  | March 2022 |  | March 2022 |  | Paid at maturity
Yankee Gas 8.48% Series B First Mortgage Bonds | (20.0) |  |  | March 2022 |  | March 2022 |  | Paid at maturity
Yankee Gas 4.31% Series U First Mortgage Bonds | 100.0 |  |  | September 2022 |  | September 2032 |  | Repaid short-term debt, paid capital expenditures and for general corporate purposes
EGMA 4.70% Series C First Mortgage Bonds | 100.0 |  |  | June 2022 |  | June 2052 |  | Repaid short-term debt, paid capital expenditures and for general corporate purposes
NSTAR Gas 4.40% Series V First Mortgage Bonds | 125.0 |  |  | July 2022 |  | August 2032 |  | Repaid short-term debt, paid capital expenditures and for general corporate purposes
Aquarion Water Company of New Hampshire 4.45% General Mortgage Bonds | (5.0) |  | 0 | July 2022 |  | July 2022 |  | Paid at maturity
Aquarion Water Company of Connecticut 4.69% Senior Notes | 70.0 |  |  | August 2022 |  | September 2052 |  | Repaid short-term debt

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