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BASIS OF PRESENTATION AND SIGNIFICANT EVENTS - Equity Method Investment in Kindred at Home (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Jul. 02, 2018
Schedule of Equity Method Investments [Line Items]        
Allocated to investment   $ 1,048 $ 1,047  
Kindred at Home        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage   40.00%   40.00%
Payments to acquire equity method investments $ 1,100      
Allocated to investment       $ 1,000
Equity Option | Put Option        
Schedule of Equity Method Investments [Line Items]        
Purchase price allocation, financial asset       236
Equity Option | Put Option | Other long-term liabilities        
Schedule of Equity Method Investments [Line Items]        
Financial asset, fair value   $ 234    
Equity Option | Call Option        
Schedule of Equity Method Investments [Line Items]        
Purchase price allocation, financial liability       $ 291
Equity Option | Call Option | Other long-term assets        
Schedule of Equity Method Investments [Line Items]        
Financial liability, fair value   $ 217