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EMPLOYEE BENEFIT PLANS - Restricted Stock Units (Details)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended
May 31, 2020
shares
Jun. 30, 2021
USD ($)
quarter
$ / shares
shares
Jun. 30, 2020
quarter
shares
USPI Management Equity Plan      
Number of Restricted Stock Units      
Unvested at the beginning of the period (in shares)   2,025,056  
Granted (in shares)   76,990  
Vested (in shares)   (373,499)  
Forfeited (in shares)   (140,120)  
Unvested at the end of the period (in shares)   1,588,427  
Weighted Average Grant Date Fair Value Per Unit      
Unvested at the beginning of the period (in dollars per share) | $ / shares   $ 34.13  
Granted (in dollars per share) | $ / shares   34.13  
Vested (in dollars per share) | $ / shares   34.13  
Forfeited (in dollars per share) | $ / shares   34.13  
Unvested at the end of the period (in dollars per share) | $ / shares   $ 34.13  
Restricted Stock Units      
Number of Restricted Stock Units      
Unvested at the beginning of the period (in shares)   2,095,206  
Granted (in shares)   749,110 1,574,325
Vested (in shares)   (492,308)  
Forfeited (in shares)   (17,914)  
Unvested at the end of the period (in shares)   2,334,094  
Weighted Average Grant Date Fair Value Per Unit      
Unvested at the beginning of the period (in dollars per share) | $ / shares   $ 25.87  
Granted (in dollars per share) | $ / shares   54.62  
Vested (in dollars per share) | $ / shares   29.78  
Forfeited (in dollars per share) | $ / shares   32.29  
Unvested at the end of the period (in dollars per share) | $ / shares   $ 34.37  
Unrecognized compensation costs | $   $ 59  
Period for recognition of unrecognized compensation costs   1 year 9 months 18 days  
Restricted Stock Units | Minimum      
Weighted Average Grant Date Fair Value Per Unit      
Award vesting percentage     0.00%
Restricted Stock Units | Maximum      
Weighted Average Grant Date Fair Value Per Unit      
Award vesting percentage     200.00%
Restricted Stock Units | Senior Officer      
Number of Restricted Stock Units      
Granted (in shares)     80,128
Restricted Stock Units | Non-Employee Directors      
Number of Restricted Stock Units      
Granted (in shares) 103,434 39,738  
Restricted Stock Units | Time Based Vesting, Three Year Period from Grant Date      
Number of Restricted Stock Units      
Granted (in shares)   261,997 517,398
Weighted Average Grant Date Fair Value Per Unit      
Vesting period   3 years 3 years
Restricted Stock Units | Eight Quarter Vesting Period      
Number of Restricted Stock Units      
Granted (in shares)   189,215  
Weighted Average Grant Date Fair Value Per Unit      
Vesting period, quarterly periods | quarter   8  
Restricted Stock Units | Time Based Vesting, One Year From Grant Date      
Number of Restricted Stock Units      
Granted (in shares)   14,192  
Restricted Stock Units | Time Based Vesting | Director      
Number of Restricted Stock Units      
Granted (in shares)   1,372  
Restricted Stock Units | Performance based vesting on the third anniversary      
Number of Restricted Stock Units      
Granted (in shares)   243,076 409,485
Restricted Stock Units | Performance Based Vesting | Minimum      
Weighted Average Grant Date Fair Value Per Unit      
Award vesting percentage   0.00%  
Restricted Stock Units | Performance Based Vesting | Maximum      
Weighted Average Grant Date Fair Value Per Unit      
Award vesting percentage   200.00%  
Restricted Stock Units | Time Based Vesting, Four Year Period From Grant Date      
Number of Restricted Stock Units      
Granted (in shares)     104,167
Weighted Average Grant Date Fair Value Per Unit      
Vesting period     4 years
Restricted Stock Units | Eleven Quarter Vesting Period      
Number of Restricted Stock Units      
Granted (in shares)     359,713
Weighted Average Grant Date Fair Value Per Unit      
Vesting period, quarterly periods | quarter     11
Restricted Stock Units | Performance Based Vesting And Settled Immediately      
Number of Restricted Stock Units      
Granted (in shares)   892  
Additional Prorated Restricted Stock Units | Time Based Vesting | Director      
Number of Restricted Stock Units      
Granted (in shares)   1,685  
Restricted Stock Units, 2021-2022 Board Service Year | Non-Employee Directors      
Number of Restricted Stock Units      
Granted (in shares)   36,681