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EMPLOYEE BENEFITS - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2015 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Years of service used in determining benefits |  | 5 years |  |
Net actuarial losses |  | $ 571 | $ 551 |
Employer matching contribution percentage | 100.00% |  |  |
Employer matching contribution, Percent of employees' pay | 4.00% |  |  |
Employer matching contribution, addition |  | 2.00% |  |
Employer contribution amount |  | $ 78 | 72 | $ 68
Qualified Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Employer contributions |  | 0 | 0 |
Expected contribution |  | 0 |  |
Non-Qualified Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Employer contributions |  | 8 | $ 8 |
Expected contribution |  | $ 8 |  |

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- Definition Incremental Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. Subject to limits set by the Internal Revenue Service. + References No definition available. + Details
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