Goodwill and Other Intangible Assets (Goodwill Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Goodwill	$ 8,951,000,000	$ 4,424,000,000	$ 4,388,000,000
Goodwill, Impairment Loss	0
Hospital operations [Member]
Goodwill [Line Items]
Goodwill	8,900,000,000	4,300,000,000
Home Care Agency Operations Reporting Unit [Member]
Goodwill [Line Items]
Goodwill	44,000,000	44,000,000
Hospital Management Services Reporting Unit [Member]
Goodwill [Line Items]
Goodwill	$ 33,000,000	$ 33,000,000