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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Definite-lived Intangible Assets      
Other indefinite-lived intangible assets $ 199,000,000 $ 140,000,000  
Increase in other indefinite-lived intangible assets 59,000,000 5,000,000  
Goodwill, impairment loss 0 0 $ 0
Impairment of intangible assets, indefinite-lived (excluding goodwill) 0 0 0
Carrying value of definite-lived intangible assets 207,000,000 47,000,000  
Accumulated amortization 29,000,000 10,000,000  
Amortization expense related to the definite-lived intangible assets 20,000,000 4,000,000 $ 4,000,000
Increase in definite-lived intangible assets 181,000,000 $ 26,000,000  
Amortization expense related to the definite-lived intangible assets, 2019 24,000,000    
Amortization expense related to the definite-lived intangible assets, 2020 23,000,000    
Amortization expense related to the definite-lived intangible assets, 2021 16,000,000    
Amortization expense related to the definite-lived intangible assets, 2022 12,000,000    
Amortization expense related to the definite-lived intangible assets, 2023 $ 11,000,000    
Weighted average      
Definite-lived Intangible Assets      
Weighted average amortization period 16 years 12 years