Commitments and Contingencies - Additional Information (Details) - USD ($)		3 Months Ended	12 Months Ended
	Jun. 01, 2018	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Commitments And Contingencies [Line Items]
Physician recruiting commitment, physician income guarantee period			12 months
Physician recruiting commitment, period of recoverability of physician income guarantee for noncommitment			3 years
Physician recruiting commitment, maximum potential future payments in excess of liability recorded		$ 10,000,000	$ 10,000,000
Malpractice loss contingency, historical claims period used by actuary to estimate liability	20 years
Malpractice Loss Contingency, Discount Rate			1.80%	1.80%	2.60%
Malpractice Loss Contingency, Accrual, Discounted		533,000,000	$ 533,000,000	$ 602,000,000
Malpractice Loss Contingency, Accrual, Undiscounted		564,000,000	564,000,000	629,000,000
Malpractice Loss Contingency, Accrual, Discounted, Current		162,000,000	162,000,000	177,000,000
Expenses related to settlement of professional liability claim				50,000,000
Recovery of full settlement amount				50,000,000
Recovery from third-party insurers of professional liability claim		22,000,000
Change in estimate reserve for professional liability claims			0	0
Pending Litigation [Member] | Litigation Matters Where Negative Outcome Is Reasonably Possible [Member]
Commitments And Contingencies [Line Items]
Attorneys' fees and other costs incurred			1,000,000	$ 3,000,000	$ 21,000,000
Professional and general liability self-insured claims reported prior to June 1, 2002, per occurrence [Member]
Commitments And Contingencies [Line Items]
Malpractice loss contingency, self-insured retention			1,000,000
Professional and general liability self-insured reported from June 1, 2002 through June 1, 2003, per occurrence [Member]
Commitments And Contingencies [Line Items]
Malpractice loss contingency, self-insured retention			2,000,000
Professional and general liability self-insured reported from June 1, 2003 and before June 1, 2005, per occurrence [Member]
Commitments And Contingencies [Line Items]
Malpractice loss contingency, self-insured retention			4,000,000
Professional and general liability self-insured claims reported on or after June 1, 2005, per occurrence [Member]
Commitments And Contingencies [Line Items]
Malpractice loss contingency, self-insured retention			5,000,000
Professional and general liability claims reported on or after June 1, 2014 [Member]
Commitments And Contingencies [Line Items]
Malpractice loss contingency, self-insured retention			10,000,000
Professional and general liability claims reported on or after June 1, 2003 [Member]
Commitments And Contingencies [Line Items]
Malpractice Insurance, Maximum Coverage Per Incident			95,000,000
Professional and general liability claims incurred and reported after January 1, 2008 [Member]
Commitments And Contingencies [Line Items]
Malpractice Insurance, Maximum Coverage Per Incident			145,000,000
Professional and general liability claims incurred and reported after June 1, 2010 [Member]
Commitments And Contingencies [Line Items]
Malpractice Insurance, Maximum Coverage Per Incident			195,000,000
Professional and general liability claims reported on or after June 1, 2015 [Member]
Commitments And Contingencies [Line Items]
Malpractice Insurance, Maximum Coverage Per Incident			215,000,000
Integrated occurrence claims reported on or after June 1, 2014 [Member]
Commitments And Contingencies [Line Items]
Malpractice Insurance, Annual Coverage Limit			50,000,000
Integrated occurrence claims reported on or after June 1, 2015 through June 1, 2020 [Member]
Commitments And Contingencies [Line Items]
Malpractice Insurance, Annual Coverage Limit			75,000,000
Integrated occurrence claims reported between June 1,2020 and June 1,2022 [Member]
Commitments And Contingencies [Line Items]
Malpractice Insurance, Annual Coverage Limit			75,000,000
Professional and general liability self-insured claims under certain policy terms until Company total aggregate coverage is met if first aggregate layer becomes fully utilized [Member]
Commitments And Contingencies [Line Items]
Malpractice loss contingency, self-insured retention			$ 10,000,000
Maximum
Commitments And Contingencies [Line Items]
Malpractice loss contingency, average lag period from occurrence to settlement			4 years
Malpractice loss contingency, settled claims as percent of total liability			1.00%
Malpractice loss contingency, self-insured retention			$ 15,000,000
Maximum | Professional And General Liability Claims Incurred And Reported On Or After June 1, 2008 [Member]
Commitments And Contingencies [Line Items]
Malpractice loss contingency, self-insured retention			$ 15,000,000
Minimum
Commitments And Contingencies [Line Items]
Malpractice loss contingency, average lag period from occurrence to settlement			3 years
Malpractice loss contingency, self-insured retention			$ 10,000,000
Minimum | Professional and general liability self-insured claims under certain policy terms until Company total aggregate coverage is met if first aggregate layer becomes fully utilized [Member]
Commitments And Contingencies [Line Items]
Malpractice loss contingency, self-insured retention			$ 15,000,000
Northwest Health – Starke [Member]
Commitments And Contingencies [Line Items]
Capital commitment, future period after acquisition for completing open capital improvement projects date			Sep. 30, 2026
Capital commitment, post-acquisition estimated cost of replacement hospital		$ 15,000,000	$ 15,000,000
Northwest Health – Starke [Member] | Maximum
Commitments And Contingencies [Line Items]
Capital commitment, future period after acquisition for completing open capital improvement projects			5 years