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BUSINESS ACQUISITIONS (Narrative) (Details) - USD ($) $ in Millions |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
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Nov. 16, 2015 | Aug. 03, 2015 | Apr. 18, 2014 | Apr. 16, 2014 | Mar. 07, 2014 | Jan. 02, 2013 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 67 | $ 728 | $ 213
Net revenues |  |  |  |  |  |  | $ 1,849 | $ 1,880 | $ 1,925 | $ 1,839 | $ 1,883 | $ 1,904 | $ 1,902 | $ 1,746 | 7,493 | 7,435 | 7,146
Total consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 264
Estimated fair value of contingent consideration |  |  | $ 26 |  |  |  |  |  |  |  |  |  |  |  |  |  |
MemorialCare [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ 35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Superior Mobile Medics, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ 27 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Solstas Lab Parnters Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  | $ 572 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, net of cash acquired |  |  |  |  | 563 |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300 |
Operating costs and expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 294 |
Integration and transaction related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17 |
Total consideration |  |  |  |  | 572 |  |  |  |  |  |  |  |  |  |  |  |
Transaction related costs due to sellers |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Solstas Lab Parnters Group [Member] | Cost of Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Integration and transaction related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |
Solstas Lab Parnters Group [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Integration and transaction related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |
Summit Health, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  | 125 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, net of cash acquired |  |  | 124 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  | 152 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working capital adjustments |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction related costs due to sellers |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  |  | 22 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration arrangements, range of outcomes, value, high |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summit Health, Inc. [Member] | To be Paid in 2016 Based on Revenue Targets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  |  |  |  |  |  | 0 |  |  |  | $ 13 |  |  |  | 0 | $ 13 |
Steward Health Care Systems, LLC [Member] [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  | $ 30 |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  | 34 |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration arrangements, range of outcomes, value, high |  |  |  |  |  |  | $ 4 |  |  |  |  |  |  |  | $ 4 |  |
Steward Health Care Systems, LLC [Member] [Member] | Non-compete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration arrangements, range of outcomes, value, high |  |  |  | $ 5 |  |  |  |  |  |  |  |  |  |  |  |  |
UMass [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred liability |  |  |  |  |  | $ 50 |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest expected to be divested |  |  |  |  |  | 18.90% |  |  |  |  |  |  |  |  |  |  |

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