ACQUISITIONS - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended				9 Months Ended	1 Months Ended
	Sep. 30, 2012	Sep. 30, 2012 Arcadian Management Services Inc State	Sep. 30, 2012 Anvita, Inc.	Nov. 05, 2012 Metropolitan Health Networks, Inc. Subsequent Event	Sep. 30, 2012 MCCI Holdings LLC	Jul. 06, 2012 Senior Bridge Family Companies Inc
Business Acquisition [Line Items]
Amount per share paid to acquire all outstanding shares				$ 11.25
Estimated transaction value to acquire the entity				$ 850
Date of acquisition of noncontrolling equity interest					2012-10
Date of acquisition		Mar. 31, 2012	Dec. 06, 2011			Jul. 06, 2012
Goodwill acquired		48	118			99
Amount allocated to other intangible assets		$ 38	$ 60			$ 14
Other intangible assets useful life, years	11 years 2 months 12 days	9 years 8 months 12 days	6 years 6 months			5 years 2 months 12 days
Arcadian Member States		15