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FAIR VALUE - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Apr. 27, 2021
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Termination of put and call options $ 377,000,000      
Unobservable Inputs (Level 3)        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value $ 68,000,000      
Unobservable Inputs (Level 3) | Investments | Fair Value Risk        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Concentration risk (percent) 0.40%      
Put option        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of financial liability $ 202,000,000     $ 64,000,000
Call option        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of financial asset 13,000,000     15,000,000
Other long-term liabilities | Put option        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of financial liability   $ 0 $ 63,000,000 45,000,000
Other long-term assets | Call option        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of financial asset   $ 0 $ 440,000,000 503,000,000
Kindred at Home        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Equity interest to be acquired per agreement (percent)   60.00%    
Term loan and commercial paper        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Short-term debt 3,500,000,000      
Commercial paper        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Short-term debt 955,000,000     600,000,000
Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Debt outstanding 9,000,000,000     6,100,000,000
Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Debt outstanding $ 10,000,000,000     $ 7,400,000,000