FAIR VALUE MEASUREMENTS (Narrative) (Details) (USD $)			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Put Option [Member]	Mar. 31, 2014 Call Option [Member]	Jan. 02, 2013 UMass Memorial Medical Center (UMass) [Member]
Business Acquisition [Line Items]
Percentage of equity interest expected to be divested					18.90%
Vesting period for derivative instrument			12 months	12 months
Fair value of debt	$ 4,200,000,000	$ 3,500,000,000
Debt Instrument Fair Value In Excess Of Carrying Value Of Debt	$ 293,000,000	$ 184,000,000