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BUSINESS ACQUISITIONS (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 01, 2021
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Goodwill   $ 7,045 $ 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