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GOODWILL AND INTANGIBLE ASSETS - Other Intangibles (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Gross $ 83 $ 82
Accumulated Amortization 25 14
Net $ 58 68
Acquired technology    
Finite-Lived Intangible Assets [Line Items]    
Useful life 7 years  
Gross $ 21 21
Accumulated Amortization 7 4
Net 14 17
Acquired relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross 38 37
Accumulated Amortization 10 5
Net $ 28 32
Naming Rights    
Finite-Lived Intangible Assets [Line Items]    
Useful life 10 years  
Gross $ 11 11
Accumulated Amortization 2 1
Net 9 10
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross 13 13
Accumulated Amortization 6 4
Net $ 7 $ 9
Minimum | Acquired relationships    
Finite-Lived Intangible Assets [Line Items]    
Useful life 5 years  
Minimum | Other    
Finite-Lived Intangible Assets [Line Items]    
Useful life 2 years  
Maximum | Acquired relationships    
Finite-Lived Intangible Assets [Line Items]    
Useful life 15 years  
Maximum | Other    
Finite-Lived Intangible Assets [Line Items]    
Useful life 7 years