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FAIR VALUE - Narrative (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Apr. 27, 2021
Mar. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value $ 102,000,000 $ 68,000,000    
Termination of put and call options   377,000,000    
Notes Payable To Banks And Commercial Paper        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long term and short term debt, combined amount 3,000,000,000 3,500,000,000    
Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Debt outstanding 9,800,000,000 9,000,000,000    
Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Senior notes debt outstanding 9,400,000,000 10,000,000,000    
Kindred at Home        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Equity interest to be acquired per agreement (percent)     60.00%  
Put option | Other long-term liabilities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of financial liability 173,000,000 202,000,000 $ 0 $ 63,000,000
Call option | Other long-term assets        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of financial asset $ 13,000,000 $ 13,000,000 $ 0 $ 440,000,000
Unobservable Inputs (Level 3) | Investments | Fair Value Risk        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Concentration risk (percent) 0.60%