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STOCK INCENTIVE AND STOCK OPTION PLANS (Details) Plan Summaries - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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 |  |
Compensation expense (net of estimated forfeitures) | $ 36 | $ 30 | $ 48
Excess tax benefit / (deficiency) associated with share-based plans | 9 | 4 | 4
Total unrecognized compensation expense (net of estimated forfeitures) | $ 55 |  |
Weighted-average maximum period of recognition of total unrecognized compensation expense related to nonvested awards | 2 years |  |
Restricted Shares released after Two Years (percent) | 33.33% |  |
Restricted Shares Released each Year after Two Years (percent) | 33.33% |  |
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% |  |
Director |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Compensation expense (net of estimated forfeitures) | $ 1 | $ 1 | $ 1
Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Vesting period | 3 years |  |
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Vesting period | 3 years |  |
Restricted Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Vesting period | 2 years |  |

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