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GOODWILL AND INTANGIBLE ASSETS (Goodwill) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Goodwill, Balance at beginning of period $ 6,619 $ 6,563
Goodwill acquired during the period 170 43
Adjustments to goodwill 0 13
Goodwill, Balance at end of period $ 6,789 $ 6,619