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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |  |
Goodwill, balance at beginning of year | $ 6,563 | $ 6,335 |
Goodwill acquired during the year | 43 | 228 | $ 335
Adjustments to goodwill | 13 | 0 |
Goodwill, balance at end of year | 6,619 | 6,563 | $ 6,335
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |
Intangible assets, gross excluding goodwill | 1,820 | 1,812 |
Accumulated amortization, intangible assets | (699) | (605) |
Total intangible assets, net | 1,121 | 1,207 |
Future amortization expense, 2020 | 96 |  |
Future amortization expense, 2021 | 90 |  |
Future amortization expense, 2022 | 87 |  |
Future amortization expense, 2023 | 85 |  |
Future amortization expense, 2024 | 82 |  |
Future amortization expense, thereafter | 445 |  |
Future amortization expense, total | 885 |  |
Intangible Assets Not Subject to Amortization - Tradenames |  |  |
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 |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |
Intangible assets, gross excluding goodwill | 1 | 1 |
Total intangible assets, net | $ 1 | 1 |
Customer Relationships |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |
Weighted average amortization period | 18 years |  |
Intangible assets, gross excluding goodwill | $ 1,367 | 1,355 |
Accumulated amortization, intangible assets | (556) | (478) |
Total intangible assets, net | $ 811 | 877 |
Non-compete Agreements |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |
Weighted average amortization period | 9 years |  |
Intangible assets, gross excluding goodwill | $ 3 | 3 |
Accumulated amortization, intangible assets | (2) | (2) |
Total intangible assets, net | $ 1 | 1 |
Technology |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |
Weighted average amortization period | 17 years |  |
Intangible assets, gross excluding goodwill | $ 104 | 104 |
Accumulated amortization, intangible assets | (56) | (50) |
Total intangible assets, net | $ 48 | 54 |
Other Intangible Assets, Subject To Amortization |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |
Weighted average amortization period | 9 years |  |
Intangible assets, gross excluding goodwill | $ 110 | 114 |
Accumulated amortization, intangible assets | (85) | (75) |
Total intangible assets, net | $ 25 | 39 |
Total Amortizing Intangible Assets |  |  |
Finite-Lived and Indefinite-lived Intangible Assets [Line Items] |  |  |
Weighted average amortization period | 17 years |  |
Intangible assets, gross excluding goodwill | $ 1,584 | 1,576 |
Accumulated amortization, intangible assets | (699) | (605) |
Total intangible assets, net | $ 885 | $ 971 |

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