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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) $ in Millions			12 Months Ended
	Jul. 01, 2015	Apr. 18, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Apr. 16, 2014	Jan. 02, 2013
Business Acquisition [Line Items]
Fair value of debt			$ 3,700	$ 4,200
Contingent consideration		$ 26
Deferred consideration			51	0	$ 0
Sale of noncontrolling interest in subsidiary			63	0	$ 0
UMass Joint Venture [Member]
Business Acquisition [Line Items]
Ownership percentage by noncontrolling owners	18.90%
Sale of noncontrolling interest in subsidiary	$ 50
Minimum [Member]
Business Acquisition [Line Items]
Fair value inputs, probability of occurrence		5.00%
Discount rate		1.50%
Maximum [Member]
Business Acquisition [Line Items]
Fair value inputs, probability of occurrence		95.00%
Discount rate		2.80%
UMass [Member]
Business Acquisition [Line Items]
Percentage of equity interest expected to be divested							18.90%
Deferred consideration	$ 50
Summit Health, Inc. [Member]
Business Acquisition [Line Items]
Contingent consideration		$ 22
Contingent consideration arrangements, range of outcomes, value, high		$ 25
Summit Health, Inc. [Member] | Contingent Consideration [Member]
Business Acquisition [Line Items]
Included in earnings			13	9
Summit Health, Inc. [Member] | To be Paid in 2016 Based on Revenue Targets [Member]
Business Acquisition [Line Items]
Contingent consideration			0	$ 13
Steward Health Care Systems, LLC [Member] [Member]
Business Acquisition [Line Items]
Contingent consideration						$ 4
Contingent consideration arrangements, range of outcomes, value, high			$ 4

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