Segment Information (Schedule of Segment Reporting Information by Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Net operating revenues	$ 4,882	$ 4,765	$ 9,793	$ 8,941
Income (loss) from continuing operations before income taxes	214	109	382	(22)
Hospital operations [Member]
Segment Reporting Information [Line Items]
Net operating revenues	4,830	4,704	9,687	8,827
Income (loss) from continuing operations before income taxes	295	224	568	262
Corporate and All Other Reporting Units [Member]
Segment Reporting Information [Line Items]
Net operating revenues	52	61	106	114
Income (loss) from continuing operations before income taxes	$ (81)	$ (115)	$ (186)	$ (284)