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BUSINESS ACQUISITIONS (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 01, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]              
Cash paid for business acquisitions   $ 20 $ 119 $ 251 $ 350    
Goodwill   $ 7,057   $ 7,057   $ 6,873 $ 6,619
Customer Relationships              
Business Acquisition [Line Items]              
Intangible assets, useful life       17 years      
Mercy Health              
Business Acquisition [Line Items]              
Cash paid for business acquisitions $ 225            
Goodwill 171            
Goodwill, expected tax deductible amount 171            
Mercy Health | Customer Relationships              
Business Acquisition [Line Items]              
Intangible assets $ 54            
Intangible assets, useful life 15 years