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GOODWILL AND INTANGIBLE ASSETS (Goodwill) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Goodwill, Balance at beginning of period $ 6,619 $ 6,563
Goodwill acquired during the period 77 43
Adjustments to goodwill (2) 13
Goodwill, Balance at end of period $ 6,694 $ 6,619