Segment Information (Schedule of Segment Reporting Information by Segment) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Net operating revenues	$ 4,195	$ 3,274
Income (loss) from continuing operations before income taxes	(135)	147
Hospital operations [Member]
Segment Reporting Information [Line Items]
Net operating revenues	4,136	3,229
Income (loss) from continuing operations before income taxes	26	207
Corporate and All Other Reporting Units [Member]
Segment Reporting Information [Line Items]
Net operating revenues	59	45
Income (loss) from continuing operations before income taxes	$ (161)	$ (60)