Segment Information (Schedule of Segment Reporting Information by Segment) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Net operating revenues	$ 4,779	$ 3,191	$ 8,964	$ 6,453
Income (loss) from continuing operations before income taxes	107	74	(24)	222
Hospital operations [Member]
Segment Reporting Information [Line Items]
Net operating revenues	4,714	3,150	8,840	6,368
Income (loss) from continuing operations before income taxes	116	130	246	337
Corporate and All Other Reporting Units [Member]
Segment Reporting Information [Line Items]
Net operating revenues	65	41	124	85
Income (loss) from continuing operations before income taxes	$ (9)	$ (56)	$ (270)	$ (115)