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Accrued Expenses (Tables)
 12 Months Ended
Dec. 31, 2022
Text Block [Abstract]  
Summary of Other Accrued Expenses
A summary of other accrued expenses at December 31 follows (dollars in millions):
 
    
    2022    
     
    2021    
  
Professional liability risks
   
$
515
 
    $ 508  
Defined contribution benefit plans
   
 
612
 
      549  
Right-of-use
operating leases
   
 
364
 
      392  
Taxes other than income
   
 
371
 
      361  
Interest
   
 
402
 
      353  
Government stimulus refund liability
   
 
81
 
      79  
Other
   
 
1,236
 
      1,080  
    
 
 
     
 
 
  
    
$
3,581
 
    $ 3,322