Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($)	3 Months Ended	6 Months Ended
	Dec. 31, 2014	Jun. 30, 2015
Goodwill [Roll Forward]
Goodwill, Beginning Balance		$ 8,951,000,000
Goodwill acquired as part of acquisitions during current year		10,000,000
Consideration and purchase price allocation adjustments for prior year's acquisitions and other adjustments		1,000,000
Impairment of goodwill allocated to hospitals held for sale	$ 0	(6,000,000)
Goodwill, Ending Balance	$ 8,951,000,000	$ 8,956,000,000