Goodwill and Other Intangible Assets (Goodwill Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Jun. 30, 2013
Goodwill [Line Items]
Goodwill	$ 4,408,138,000	$ 4,412,097,000
Goodwill, Impairment Loss	0
Hospital Operations [Member]
Goodwill [Line Items]
Goodwill		4,300,000,000
Home Care Agency Operations Reporting Unit [Member]
Goodwill [Line Items]
Goodwill		43,600,000
Hospital Management Services Reporting Unit [Member]
Goodwill [Line Items]
Goodwill		$ 33,300,000