Segment Information (Schedule of Segment Reporting Information by Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Net operating revenues	$ 4,999	$ 4,911
Income (loss) from continuing operations before income taxes	63	168
Hospital Operations [Member]
Segment Reporting Information [Line Items]
Net operating revenues	4,944	4,857
Income (loss) from continuing operations before income taxes	143	273
Corporate and All Other Reporting Units [Member]
Segment Reporting Information [Line Items]
Net operating revenues	55	54
Income (loss) from continuing operations before income taxes	$ (80)	$ (105)