Accounting Policies - Schedule of Estimated Cost of Uncompensated Care (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]
Gross patient charges	$ 181,141	$ 165,614	$ 141,516
Patient care costs (salaries and benefits, supplies, other operating expenses and depreciation and amortization)	29,606	28,533	25,554
Cost-to-charges ratio	16.30%	17.20%	18.10%
Total uncompensated care	15,565	13,841	11,214
Estimated cost of total uncompensated care	$ 2,537	$ 2,381	$ 2,030