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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |
Goodwill, balance at beginning of year | $ 6,335 | $ 6,000
Goodwill acquired during the year | 228 | 335
Goodwill, balance at end of year | 6,563 | 6,335
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |
Intangible assets, gross excluding goodwill | 1,812 | 1,653
Accumulated amortization, intangible assets | (605) | (534)
Total intangible assets, net | 1,207 | 1,119
Future amortization expense, 2019 | 97 |
Future amortization expense, 2020 | 96 |
Future amortization expense, 2021 | 90 |
Future amortization expense, 2022 | 86 |
Future amortization expense, 2023 | 85 |
Future amortization expense, thereafter | 517 |
Future amortization expense, total | 971 |
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 | $ 1,355 | 1,210
Accumulated amortization, intangible assets | (478) | (404)
Total intangible assets, net | $ 877 | 806
Non-compete Agreements [Member] |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |
Weighted average amortization period | 8 years |
Intangible assets, gross excluding goodwill | $ 3 | 7
Accumulated amortization, intangible assets | (2) | (5)
Total intangible assets, net | $ 1 | 2
Technology [Member] |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |
Weighted average amortization period | 17 years |
Intangible assets, gross excluding goodwill | $ 104 | 95
Accumulated amortization, intangible assets | (50) | (45)
Total intangible assets, net | $ 54 | 50
Other Intangible Assets, Subject To Amortization [Member] |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |
Weighted average amortization period | 9 years |
Intangible assets, gross excluding goodwill | $ 114 | 105
Accumulated amortization, intangible assets | (75) | (80)
Total intangible assets, net | $ 39 | 25
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 | $ 1,576 | 1,417
Accumulated amortization, intangible assets | (605) | (534)
Total intangible assets, net | $ 971 | $ 883

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