Basis of Presentation and Significant Accounting Policies - Additional Information (Details) $ in Millions			1 Months Ended	3 Months Ended		6 Months Ended
	May 01, 2020 Item	Jan. 01, 2020 USD ($) Item	Jul. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Cost of Revenue [Abstract]
Corporate office costs				$ 57	$ 43	$ 95	$ 86
Stock-based compensation expense				3	3	5	6
Third-Party Reimbursement [Abstract]
Amounts due to third party payors				81		81		$ 83
Amounts due from third party payors				124		124		$ 137
Net Operating Revenues, Policy [Abstract]
Charity care services charges excluded from net operating revenues				138	142	304	284
Accounting for the Impairment or Disposal of Long-Lived Assets
Gain (loss) on disposition of business						(56)	(71)
Impairment and gain (loss) on sale of businesses, net						56	71
Goodwill allocated to hospital disposal group held for sale				103	68	$ 103	68
CARES Act
Accounting for the Impairment or Disposal of Long-Lived Assets
Medicare accelerated payments received under the Cares Act				1,200
Medicare accelerated payments interest free program description						The Medicare accelerated payments are interest free for up to 12 months and the program currently requires that CMS recoup the accelerated payments beginning 120 days after receipt by the provider, by withholding future Medicare fee-for-service payments for claims until such time as the full accelerated payment has been recouped. The program currently requires that any outstanding balance remaining after 12 months must be repaid by the provider or be subjected to a 10.25% annual interest rate
Medicare accelerated payments interest rate						10.25%
CARES Act | Paycheck Protection Program and Health Care Enhancement Act
Accounting for the Impairment or Disposal of Long-Lived Assets
Percentage of maximum accelerated payment						100.00%
Medicare accelerated and advance payment program period						6 months
Medicare accelerated and advance payment program to be repaid beginning day after receipt						120 days
Public Health and Social Services Emergency Fund (the "PHSSEF") | CARES Act | Paycheck Protection Program and Health Care Enhancement Act
Accounting for the Impairment or Disposal of Long-Lived Assets
Accelerated payments received under the Cares Act				564		$ 175,000
Public Health and Social Services Emergency Fund (the "PHSSEF") | CARES Act | Paycheck Protection Program and Health Care Enhancement Act | Subsequent Event
Accounting for the Impairment or Disposal of Long-Lived Assets
Accelerated payments received under the Cares Act			$ 109
Public Health and Social Services Emergency Fund (the "PHSSEF") | CARES Act | Paycheck Protection Program and Health Care Enhancement Act | Operating Costs and Expenses
Accounting for the Impairment or Disposal of Long-Lived Assets
Accelerated payments received under the Cares Act				448		448
Hospitals Sold or Deemed Held for Sale
Accounting for the Impairment or Disposal of Long-Lived Assets
Gain (loss) on disposition of business		$ 21				13
Number of hospitals sold | Item	2	3
Adjustment for Carrying Value of Other Long-Lived Assets at Underperforming Hospitals
Accounting for the Impairment or Disposal of Long-Lived Assets
Impairment and gain (loss) on sale of businesses, net						64
Health Care, Patient Service
Net Operating Revenues, Policy [Abstract]
Value of charity care services at the Company's standard charges included in contractual allowances				$ 17	$ 18	$ 36	$ 33