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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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accounting Policies [Abstract]
Patient care costs (salaries and benefits, supplies, other operating expenses and depreciation and amortization)	$ 11,060	$ 9,946	$ 32,619	$ 29,684
Cost-to-charges ratio (patient care costs as percentage of gross patient charges)	12.30%	12.70%	12.10%	12.60%
Total uncompensated care	$ 7,923	$ 6,786	$ 22,703	$ 19,524
Multiply by the cost-to-charges ratio	12.30%	12.70%	12.10%	12.60%
Estimated cost of total uncompensated care	$ 975	$ 862	$ 2,747	$ 2,460