Annual report pursuant to Section 13 and 15(d)

STOCK INCENTIVE AND STOCK OPTION PLANS (Details) Plan Summaries

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STOCK INCENTIVE AND STOCK OPTION PLANS (Details) Plan Summaries - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 8,500,000    
Stock options' expiration from the date of grant 10 years    
Number of shares in every even block of KESIP shares 100    
Stock options granted for every even block of 100 KESIP shares purchased by the employee 50    
Vesting period 2 years    
Compensation expense (net of estimated forfeitures) $ 1 $ 1 $ 2
Excess tax benefit / (deficiency) associated with share-based plans 4 2 2
Total unrecognized compensation expense (net of estimated forfeitures) $ 40    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award      
Target award based on the actual performance (as a percent) 0.00%    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award      
Target award based on the actual performance (as a percent) 200.00%    
Weighted-average maximum period of recognition of total unrecognized compensation expense related to nonvested awards 2 years    
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period 3 years    
Compensation expense (net of estimated forfeitures) $ 48 $ 52 $ 39