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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounting Policies [Abstract]
Patient care costs (salaries and benefits, supplies, other operating expenses and depreciation and amortization)	$ 10,953	$ 9,871	$ 21,559	$ 19,738
Cost-to-charges ratio (patient care costs as percentage of gross patient charges)	12.20%	12.60%	12.00%	12.50%
Total uncompensated care	$ 7,695	$ 6,486	$ 14,780	$ 12,738
Multiply by the cost-to-charges ratio	12.20%	12.60%	12.00%	12.50%
Estimated cost of total uncompensated care	$ 938	$ 817	$ 1,774	$ 1,592