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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Jun. 30, 2015
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill, Balance at beginning of period |  |  | $ 6,032 | $ 5,649 | $ 5,649 |
Goodwill acquired during the period |  |  | 23 |  | 383 |
Reclassification to assets held for sale |  |  | (160) |  | 0 |
Goodwill, Balance at end of period | $ 5,895 |  | 5,895 |  | 6,032 |
Intangible assets, Cost | 1,390 |  | 1,390 |  | 1,487 |
Intangible assets, Accumulated Amortization | (386) |  | (386) |  | (416) |
Amortizing intangible assets, Net | 1,004 |  | 1,004 |  | 1,071 |
Amortization expense | 20 | $ 24 | 61 | $ 71 |  |
Remainder of 2015 | 19 |  | 19 |  |  |
Future Amortization Expense, 2016 | 72 |  | 72 |  |  |
Future Amortization Expense, 2017 | 68 |  | 68 |  |  |
Future Amortization Expense, 2018 | 63 |  | 63 |  |  |
Future Amortization Expense, 2019 | 63 |  | 63 |  |  |
Future Amortization Expense, 2020 | 63 |  | 63 |  |  |
Future Amortization Expense, Thereafter | 420 |  | 420 |  |  |
Future Amortization Expense, Total | 768 |  | 768 |  |  |
Held-for-sale [Member] |  |  |  |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, Cost | 48 |  | 48 |  |  |
Intangible assets, Accumulated Amortization | (32) |  | (32) |  |  |
Amortizing intangible assets, Net | 16 |  | 16 |  |  |
Intangible Assets Not Subject to Amortization - Tradenames [Member] |  |  |  |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, Cost | 235 |  | 235 |  | 244 |
Amortizing intangible assets, Net | 235 |  | 235 |  | 244 |
Intangible Assets Not Subject to Amortization - Other [Member] |  |  |  |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, Cost | 1 |  | 1 |  | 1 |
Amortizing intangible assets, Net | 1 |  | $ 1 |  | 1 |
Customer-related intangibles [Member] |  |  |  |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted Average Amortization Period |  |  | 19 years |  |  |
Intangible assets, Cost | 926 |  | $ 926 |  | 929 |
Intangible assets, Accumulated Amortization | (283) |  | (283) |  | (259) |
Amortizing intangible assets, Net | 643 |  | $ 643 |  | 670 |
Noncompete Agreements [Member] |  |  |  |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted Average Amortization Period |  |  | 5 years |  |  |
Intangible assets, Cost | 6 |  | $ 6 |  | 43 |
Intangible assets, Accumulated Amortization | (3) |  | (3) |  | (37) |
Amortizing intangible assets, Net | 3 |  | $ 3 |  | 6 |
Technology [Member] |  |  |  |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted Average Amortization Period |  |  | 14 years |  |  |
Intangible assets, Cost | 117 |  | $ 117 |  | 118 |
Intangible assets, Accumulated Amortization | (45) |  | (45) |  | (38) |
Amortizing intangible assets, Net | 72 |  | $ 72 |  | 80 |
Other [Member] |  |  |  |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted Average Amortization Period |  |  | 9 years |  |  |
Intangible assets, Cost | 105 |  | $ 105 |  | 152 |
Intangible assets, Accumulated Amortization | (55) |  | (55) |  | (82) |
Amortizing intangible assets, Net | 50 |  | $ 50 |  | 70 |
Total Amortizing Intangible Assets [Member] |  |  |  |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted Average Amortization Period |  |  | 17 years |  |  |
Intangible assets, Cost | 1,154 |  | $ 1,154 |  | 1,242 |
Intangible assets, Accumulated Amortization | (386) |  | (386) |  | (416) |
Amortizing intangible assets, Net | $ 768 |  | $ 768 |  | 826 |
Noncompete Agreements, Fully Amortized [Member] |  |  |  |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, Cost |  |  |  |  |  | $ 37
Intangible assets, Accumulated Amortization |  |  |  |  |  | $ (37)
Solstas, Summit Health, and Steward [Member] |  |  |  |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets |  |  |  |  | $ 270 |

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