Goodwill and Other Intangible Assets (Goodwill Narrative) (Details) - USD ($)	3 Months Ended	6 Months Ended
	Dec. 31, 2014	Jun. 30, 2015
Goodwill [Line Items]
Goodwill	$ 8,951,000,000	$ 8,956,000,000
Goodwill, Impairment Loss	$ 0	6,000,000
Hospital operations [Member]
Goodwill [Line Items]
Goodwill		8,900,000,000
Home Care Agency Operations Reporting Unit [Member]
Goodwill [Line Items]
Goodwill		44,000,000
Hospital Management Services Reporting Unit [Member]
Goodwill [Line Items]
Goodwill		$ 33,000,000