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GOODWILL AND INTANGIBLE ASSETS (Goodwill) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Goodwill [Roll Forward]    
Goodwill, Balance at beginning of period $ 6,873 $ 6,619
Goodwill acquired during the period 174 247
Adjustments to goodwill (2) 7
Goodwill, Balance at end of period $ 7,045 $ 6,873
MACL    
Business Acquisition [Line Items]    
Percentage of interests acquired   56.00%