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ACQUISITIONS - Narrative (Details)
$ in Millions
Aug. 17, 2021
USD ($)
state
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Business Acquisition [Line Items]      
Equity method investment carrying value   $ 143 $ 1,170
KAH      
Business Acquisition [Line Items]      
Remaining ownership percentage acquired 60.00%    
Enterprise value of acquiree including existing equity value $ 8,200    
Existing equity value $ 2,400    
Minority ownership prior to acquisition (percent) 40.00%    
Remeasurement gain $ 1,100    
Geographic coverage overlap (percent) 65.00%    
Transaction amount, net of existing equity stake $ 5,800    
Goodwill expected to be tax deductible 132    
Acquisition-related costs 45    
KAH | Trade names      
Business Acquisition [Line Items]      
Amortizing intangible assets acquired $ 18    
Amortizing intangible assets acquired estimated weighted average useful life (in years) 10 years    
KAH      
Business Acquisition [Line Items]      
Equity method investment carrying value $ 1,300    
KAH      
Business Acquisition [Line Items]      
Number of states with locations | state 40