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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Goodwill, balance at beginning of year $ 6,619 $ 6,563
Goodwill acquired during the year 247 43
Adjustments to goodwill 7 13
Goodwill, balance at end of year 6,873 6,619
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]    
Intangible assets, gross excluding goodwill 1,967 1,820
Accumulated amortization, intangible assets (800) (699)
Total intangible assets, net 1,167 1,121
Future amortization expense    
2021 101  
2022 98  
2023 96  
2024 93  
2025 92  
Thereafter 451  
Total 931  
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 17 years  
Intangible assets, gross excluding goodwill $ 1,479 1,367
Accumulated amortization, intangible assets (638) (556)
Total intangible assets, net $ 841 811
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 15 years  
Intangible assets, gross excluding goodwill $ 141 104
Accumulated amortization, intangible assets (65) (56)
Total intangible assets, net $ 76 48
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 $ 108 110
Accumulated amortization, intangible assets (95) (85)
Total intangible assets, net $ 13 25
Total Amortizing Intangible Assets    
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]    
Weighted average amortization period 17 years  
Intangible assets, gross excluding goodwill $ 1,731 1,584
Accumulated amortization, intangible assets (800) (699)
Total intangible assets, net $ 931 $ 885