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BUSINESS ACQUISITIONS (Narrative) (Details) - USD ($) $ in Millions |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
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Feb. 29, 2016 | Nov. 16, 2015 | Aug. 03, 2015 | Apr. 18, 2014 | Apr. 16, 2014 | Mar. 07, 2014 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 139 | $ 63 | $ 768
Goodwill acquired during the year |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95 | 33 | 383
Goodwill deductible for tax purposes |  |  |  |  |  |  | $ 95 |  |  |  | $ 32 |  |  |  | 95 | 32 | 90
Finite-lived intangibles |  |  |  |  |  |  | 44 |  |  |  | 26 |  |  |  | 44 | 26 | 270
Business acquisitions, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 139 | 67 | 728
Net revenues |  |  |  |  |  |  | 1,861 | $ 1,885 | $ 1,906 | $ 1,863 | 1,849 | $ 1,880 | $ 1,925 | $ 1,839 | $ 7,515 | 7,493 | 7,435
Estimated fair value of contingent consideration |  |  |  | $ 26 |  |  |  |  |  |  |  |  |  |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 years |  |
Non-compete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years |  |
Clinical Laboratory Partners, LLC (CLP) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill deductible for tax purposes | $ 91 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | 135 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Clinical Laboratory Partners, LLC (CLP) [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles | $ 43 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  | $ 572 |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  | 572 |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles |  |  |  |  |  | 210 |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, net of cash acquired |  |  |  |  |  | 563 |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300
Operating costs and expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 294
Integration and transaction related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17
Estimated fair value of contingent consideration |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Transaction related costs due to sellers |  |  |  |  |  | 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
Solstas Lab Parnters Group [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles |  |  |  |  |  | $ 203 |  |  |  |  |  |  |  |  |  |  |
Summit Health, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  | 152 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  | 125 |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles |  |  |  | 38 |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, net of cash acquired |  |  |  | 124 |  |  |  |  |  |  |  |  |  |  |  |  |
Working capital adjustments |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  |  |  | 22 |  |  |  |  |  |  | $ 0 |  |  |  |  | $ 0 | $ 13
Transaction related costs due to sellers |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration arrangements, range of outcomes, value, high |  |  |  | 25 |  |  |  |  |  |  |  |  |  |  |  |  |
Summit Health, Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles |  |  |  | $ 33 |  |  |  |  |  |  |  |  |  |  |  |  |
Steward Health Care Systems, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  | $ 34 |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration arrangements, range of outcomes, value, high |  |  |  |  |  |  | $ 4 |  |  |  |  |  |  |  | $ 4 |  |
Steward Health Care Systems, LLC [Member] | Non-compete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration arrangements, range of outcomes, value, high |  |  |  |  | $ 5 |  |  |  |  |  |  |  |  |  |  |  |

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