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Basis of Presentation and Significant Accounting Policies - Schedule of Estimated Cost of Uncompensated Care (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accounting Policies [Abstract]
Patient care costs (salaries and benefits, supplies, other operating expenses and depreciation and amortization)	$ 9,916	$ 10,953	$ 21,258	$ 21,559
Cost-to-charges ratio (patient care costs as percentage of gross patient charges)	12.60%	12.20%	12.20%	12.00%
Total uncompensated care	$ 6,729	$ 7,695	$ 14,602	$ 14,780
Multiply by the cost-to-charges ratio	12.60%	12.20%	12.20%	12.00%
Estimated cost of total uncompensated care	$ 844	$ 938	$ 1,781	$ 1,774