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GOODWILL AND INTANGIBLE ASSETS (Goodwill) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Goodwill [Roll Forward] |  |
Goodwill, Balance at beginning of period | $ 6,873 | $ 6,619
Goodwill acquired during the period | 0 | 247
Adjustments to goodwill | (3) | 7
Goodwill, Balance at end of period | $ 6,870 | $ 6,873
MACL |  |
Business Acquisition [Line Items] |  |
Percentage of interests acquired |  | 56.00%

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