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FAIR VALUE MEASUREMENTS - Schedule of Long Term Debt Redemption and Issuance (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Feb. 28, 2023 | Jan. 31, 2023
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ME | Promissory Notes | 3.50% Series B Senior Notes Due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Issuance interest rate | 3.50% |  |
Face amount of debt | $ 300 |  |
ME | Promissory Notes | 3.50% Series B Senior Notes Due 2023 | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Issuance interest rate | 3.50% |  |
Face amount of debt | $ 300 |  |
ME | Promissory Notes | 5.20%, 425 Million Notes Maturing 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Issuance interest rate | 5.20% |  |
Face amount of debt | $ 425 |  |
WP | First Mortgage Bond | 5.29%, 50 Million Notes Maturing 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Issuance interest rate |  |  | 5.29%
Face amount of debt |  |  | $ 50
MAIT | Promissory Notes | 5.39%, 175 Million Notes Maturing 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Issuance interest rate |  | 5.39% |
Face amount of debt |  | $ 175 |
PN | Promissory Notes | 5.15%, 300 Million Notes Maturing 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Issuance interest rate | 5.15% |  |
Face amount of debt | $ 300 |  |

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