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STOCK COMPENSATION (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock based compensation expense $ 13 $ 9
Related deferred income tax benefit 2 1
Stock option expense    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock based compensation expense 2 1
RSU expense    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock based compensation expense $ 11 $ 8