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Basis of Presentation and Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Cost of Revenue, Policy [Abstract]      
Corporate office costs $ 63 $ 60  
Third Party Reimbursement [Abstract]      
Amounts due to third party payors 115   $ 118
Amounts due from third party payors 108   $ 114
Net Operating Revenues, Policy [Abstract]      
Charity care services charges excluded from net operating revenues 363 229  
Value of charity care services at the Company's standard charges included in contractual allowances 41 26  
Accounting for the Impairment or Disposal of Long-Lived Assets      
Gain (loss) on disposition of business (21)    
CARES Act | Public Health And Social Services Emergency Fund | Paycheck Protection Program and Health Care Enhancement Act      
CARES Act and PPPHCE Act Funds [Abstract]      
Payments through the PHSSEF and various state and local programs 42 3  
CARES Act | Public Health And Social Services Emergency Fund | Accrued Liabilities - Other | Paycheck Protection Program and Health Care Enhancement Act      
CARES Act and PPPHCE Act Funds [Abstract]      
Payments through the PHSSEF and various state and local programs 9    
CARES Act | Operating Costs and Expenses | Public Health And Social Services Emergency Fund | Paycheck Protection Program and Health Care Enhancement Act      
CARES Act and PPPHCE Act Funds [Abstract]      
Payments through the PHSSEF and various state and local programs 47 $ 82  
Adjustment for Carrying Value of Other Long-Lived Assets at Underperforming Hospitals      
Accounting for the Impairment or Disposal of Long-Lived Assets      
Impairment of long-lived assets held for sale 27    
Hospitals Sold or Deemed Held for Sale | Certain Hospitals      
Accounting for the Impairment or Disposal of Long-Lived Assets      
Gain (loss) on disposition of business (2)    
Hospitals Closed      
Accounting for the Impairment or Disposal of Long-Lived Assets      
Gain (loss) on disposition of business (8)    
Shared Service Center      
Accounting for the Impairment or Disposal of Long-Lived Assets      
Gain (loss) on disposition of business $ (5)