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EQUITY METHOD INVESTMENT - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]        
Purchase of equity method investment   $ 0 $ 0 $ 1,095
Put option        
Schedule of Equity Method Investments [Line Items]        
Fair value of financial liability   45 28  
Call option        
Schedule of Equity Method Investments [Line Items]        
Fair value of financial asset   503 557  
Options        
Schedule of Equity Method Investments [Line Items]        
(Income) expense on put and call options   $ 71 $ 506  
Kindred at Home        
Schedule of Equity Method Investments [Line Items]        
Equity method investment ownership (percent) 40.00%      
Purchase of equity method investment $ 1,100