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ACCOUNTS RECEIVABLE - Allowance (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Accounts receivable and allowance for doubtful accounts        
Estimated costs of caring $ 155 $ 187 $ 298 $ 375
Uninsured patients        
Accounts receivable and allowance for doubtful accounts        
Estimated costs of caring 136 158 258 326
Charity care patients        
Accounts receivable and allowance for doubtful accounts        
Estimated costs of caring $ 19 $ 29 $ 40 $ 49