Basis of Presentation and Significant Accounting Policies - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) Hospital	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Cost of Revenue, Policy [Abstract]
Corporate office costs	$ 61	$ 60	$ 187	$ 179
Third Party Reimbursement [Abstract]
Amounts due to third party payors	119		119		$ 101
Amounts due from third party payors	121		121		$ 97
Net Operating Revenues, Policy [Abstract]
Charity care services charges excluded from net operating revenues	355	285	1,000	1,100
Value of charity care services at the Company's standard charges included in contractual allowances	$ 39	33	$ 111	121
Accounting for the Impairment or Disposal of Long-Lived Assets
Number of hospitals sold | Hospital			3
Impairment of long-lived assets held for sale				54
Hospitals Sold or Deemed Held for Sale
Accounting for the Impairment or Disposal of Long-Lived Assets
Net gain (loss) on disposition of business			$ 9
Gain (loss) on disposition of business			63
Impairment of amount related to several assets idled disposed or held for sale			8
Impairment of long-lived assets held for sale			25
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			21	$ 6
Hospital Closures of Shorepoint Health Venice in Venice, Florida and Near-complete Closure of First Hospital Wyoming Valley (Psychiatric Hospital) in Wilkes-Barre, Pennsylvania
Accounting for the Impairment or Disposal of Long-Lived Assets
Impairment of long-lived assets held for sale		$ 48
Shared Service Center
Accounting for the Impairment or Disposal of Long-Lived Assets
Net gain (loss) on disposition of business			$ 84