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ACQUISITION OF ASSETS OF COLUMBIA GAS OF MASSACHUSETTS - Preliminary Allocation of the Cash Purchase Price (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Oct. 09, 2020
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 4,453,618 | $ 4,445,988 |
CMA |  |  |
Business Acquisition [Line Items] |  |  |
Current Assets |  |  | $ 138,000
Restricted Cash |  |  | 57,000
PP&E |  |  | 1,184,000
Goodwill |  |  | 50,000
Other Noncurrent Assets, excluding Goodwill |  |  | 131,000
Other Current Liabilities |  |  | (81,000)
Other Noncurrent Liabilities |  |  | (310,000)
Cash Purchase Price |  |  | $ 1,169,000

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