BASIS OF PRESENTATION AND SIGNIFICANT EVENTS (Details) - USD ($)			3 Months Ended		9 Months Ended
	Aug. 25, 2016	Jul. 02, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Aug. 02, 2016
Business Acquisition [Line Items]
Dividends per common share (in dollars per share)	$ 0.29		$ 0.29	$ 0.29	$ 0.87	$ 0.86
Maximum dividend allowed prior to merger (in dollars per share)		$ 0.29
Agreement and Plan of Merger with Aetna Inc.
Business Acquisition [Line Items]
Number of shares one share of common stock is converted into		0.8375
Cash received for each share converted		$ 125
Total transaction cost, including assumption of debt		$ 37,000,000,000
Medicare Advantage Assets | Molina Healthcare | U.S. Department Of Justice vs. Humana and Aetna
Business Acquisition [Line Items]
Sale price							$ 117,000,000