Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014 Hospital State Surgery_Center	Jun. 30, 2013	Jun. 30, 2014 Hospital State Surgery_Center	Jun. 30, 2013
Accounting Policies [Abstract]
Number of owned and operated hospitals	165		165
Number of freestanding surgery centers	115		115
Number of facilities locations	20		20
General and administrative expense	$ 67	$ 65	$ 135	$ 131
Adjustments to Medicare revenues	$ 142		$ 142
Adjustment to increase Medicaid revenues in diluted per share	$ 0.20		$ 0.20