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COMMITMENTS AND CONTINGENCIES - Spent Nuclear Fuel Obligations - Yankee Companies (Details) - Yankee Companies - USD ($) $ in Millions | Jun. 08, 2022 | Mar. 25, 2021
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Loss Contingencies [Line Items] |  |
Damages sought | $ 33.1 |
CYAPC, YAEC, and MYAPC |  |
Loss Contingencies [Line Items] |  |
Damages sought |  | $ 120.4

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