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GOODWILL AND INTANGIBLE ASSETS (Schedules) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Roll Forward] |  |  |
Goodwill, balance at beginning of year | $ 6,000 | $ 5,905 |
Goodwill acquired during the year | 335 | 95 | $ 33
Goodwill, balance at end of year | 6,335 | 6,000 | $ 5,905
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |
Intangible assets, gross excluding goodwill | 1,653 | 1,409 |
Accumulated amortization, intangible assets | (534) | (460) |
Total intangible assets, net | 1,119 | 949 |
Future amortization expense, 2018 | 82 |  |
Future amortization expense, 2019 | 81 |  |
Future amortization expense, 2020 | 81 |  |
Future amortization expense, 2021 | 74 |  |
Future amortization expense, 2022 | 72 |  |
Future amortization expense, thereafter | 493 |  |
Future amortization expense, total | 883 |  |
Intangible Assets Not Subject to Amortization - Tradenames [Member] |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |
Intangible assets, gross excluding goodwill | 235 | 235 |
Total intangible assets, net | 235 | 235 |
Intangible Assets Not Subject to Amortization - Other [Member] |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |
Intangible assets, gross excluding goodwill | 1 | 1 |
Total intangible assets, net | $ 1 | 1 |
Customer Relationships [Member] |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |
Weighted average amortization period | 18 years |  |
Intangible assets, gross excluding goodwill | $ 1,210 | 971 |
Accumulated amortization, intangible assets | (404) | (346) |
Total intangible assets, net | $ 806 | 625 |
Non-compete Agreements [Member] |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |
Weighted average amortization period | 7 years |  |
Intangible assets, gross excluding goodwill | $ 7 | 6 |
Accumulated amortization, intangible assets | (5) | (4) |
Total intangible assets, net | $ 2 | 2 |
Technology [Member] |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |
Weighted average amortization period | 17 years |  |
Intangible assets, gross excluding goodwill | $ 95 | 93 |
Accumulated amortization, intangible assets | (45) | (40) |
Total intangible assets, net | $ 50 | 53 |
Other Intangible Assets, Subject To Amortization [Member] |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |
Weighted average amortization period | 10 years |  |
Intangible assets, gross excluding goodwill | $ 105 | 103 |
Accumulated amortization, intangible assets | (80) | (70) |
Total intangible assets, net | $ 25 | 33 |
Total Amortizing Intangible Assets [Member] |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |
Weighted average amortization period | 17 years |  |
Intangible assets, gross excluding goodwill | $ 1,417 | 1,173 |
Accumulated amortization, intangible assets | (534) | (460) |
Total intangible assets, net | $ 883 | $ 713 |

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