Basis of Presentation and Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Cost of Revenue, Policy [Abstract]
Corporate office costs	$ 57	$ 52	$ 120	$ 112
Third Party Reimbursement [Abstract]
Amounts due to third party payors	107		107		$ 118
Amounts due from third party payors	100		100		$ 114
Net Operating Revenues, Policy [Abstract]
Charity care services charges excluded from net operating revenues	409	215	772	444
Value of charity care services at the Company's standard charges included in contractual allowances	47	26	88	52
Accounting for the Impairment or Disposal of Long-Lived Assets
Gain (loss) on disposition of business				(23)
Impairment charge of long-lived assets sold			6
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			52	7
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			11
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	$ 8	$ 1	$ 55	83
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				28
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				(3)
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				$ (7)