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BUSINESS ACQUISITIONS, DISPOSITIONS, GOODWILL AND INTANGIBLE ASSETS - Future Amortization of Intangible Assets (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
segment
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Goodwill [Line Items]          
Amortization of intangible assets $ 26 $ 30 $ 76 $ 88  
Goodwill 9,906   $ 9,906   $ 9,884
Reporting Unit with Carrying Value within 20% of Fair Value          
Goodwill [Line Items]          
Number of reporting units | segment     1    
Goodwill $ 917   $ 917    
Reporting unit, percentage of fair value in excess of carrying amount 13.00%   13.00%    
Sensitivity analysis of fair value, reporting unit, impact of 100 basis point change in discount rate $ 84   $ 84