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GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill      
Gross Carrying Amount $ 294 $ 289  
Net Carrying Amount 294 289 $ 289
Amortizable intangibles:      
Gross Carrying Amount 98 95  
Accumulated Amortization (80) (80)  
Net Carrying Amount 18 15  
Amortization of intangible assets $ 5 5 $ 5
Customer contact lists      
Amortizable intangibles:      
Weighted Average Amortization Period 10 years    
Gross Carrying Amount $ 98 90  
Accumulated Amortization (80) (76)  
Net Carrying Amount $ 18 14  
Developed technology      
Amortizable intangibles:      
Weighted Average Amortization Period 5 years    
Gross Carrying Amount $ 0 5  
Accumulated Amortization 0 (4)  
Net Carrying Amount $ 0 $ 1