Basis of Presentation and Significant Accounting Policies (Professional Liability Claims Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Professional and general liability self-insured claims reported prior to June 1, 2002, per occurrence [Member]
Malpractice Insurance [Line Items]
Malpractice loss contingency, self-insured retention	$ 1
Professional and general liability self-insured reported from June 1, 2002 through June 1, 2003, per occurrence [Member]
Malpractice Insurance [Line Items]
Malpractice loss contingency, self-insured retention	2
Professional and general liability self-insured reported from June 1, 2003 and before June 1, 2005, per occurrence [Member]
Malpractice Insurance [Line Items]
Malpractice loss contingency, self-insured retention	4
Professional and general liability self-insured claims reported on or after June 1, 2005, per occurrence [Member]
Malpractice Insurance [Line Items]
Malpractice loss contingency, self-insured retention	5
Professional and general liability claims reported on or after June 1, 2003 [Member]
Malpractice Insurance [Line Items]
Malpractice loss contingency, self-insured retention	95
Professional and general liability claims incurred and reported after January 1, 2008 [Member]
Malpractice Insurance [Line Items]
Malpractice Insurance, Maximum Coverage Per Incident	145
Professional and general liability claims incurred and reported after January 1, 2010 [Member]
Malpractice Insurance [Line Items]
Malpractice Insurance, Maximum Coverage Per Incident	195
Professional and general liability self-insured claims under certain policy terms until Company total aggregate coverage is met if first aggregate layer becomes fully utilized [Member]
Malpractice Insurance [Line Items]
Malpractice loss contingency, self-insured retention	10
Triad professional and general liability self-insured claims during 2007 [Member]
Malpractice Insurance [Line Items]
Malpractice loss contingency, self-insured retention	10
Minimum [Member]
Malpractice Insurance [Line Items]
Malpractice loss contingency, self-insured retention	10
Minimum [Member] | Triad professional and general liability self-insured claims after December 31, 2006 [Member]
Malpractice Insurance [Line Items]
Malpractice loss contingency, self-insured retention	1
Maximum [Member]
Malpractice Insurance [Line Items]
Malpractice loss contingency, self-insured retention	15
Maximum [Member] | Triad professional and general liability self-insured claims after December 31, 2006 [Member]
Malpractice Insurance [Line Items]
Malpractice loss contingency, self-insured retention	$ 5