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BENEFIT PLANS - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution of first 1% of contribution | 100.00% |  |
Employer matching contribution of next 5% of contribution | 50.00% |  |
Employer maximum matching contribution | 3.50% |  |
Defined contribution plan, cost recognized | $ 36 | $ 35 | $ 35
Defined benefit plan, benefit obligation, period (increase) decrease for actuarial loss, discount rates | $ 31 | 68 |
Defined benefit plan, benefit obligation, period (increase) decrease for actuarial loss, discount rates, demographic assumptions |  | 2 |
Defined benefit plan, benefit obligation, period (increase) decrease for actuarial loss, discount rates, plan experience different than anticipated |  | $ 13 |
Expected return on plan assets | 4.00% |  |
Percentage of total plan assets categorized as level 1 | 75.00% | 75.00% |
Expected contributions to defined benefit pension plans in 2020 | $ 17 |  |
Minimum | Defined Benefit Plan, Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for plan asset of equity securities | 30.00% |  |
Minimum | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for plan asset of equity securities | 30.00% |  |
Minimum | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for plan asset of equity securities | 0.00% |  |
Minimum | Other Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for plan asset of equity securities | 0.00% |  |
Maximum | Defined Benefit Plan, Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for plan asset of equity securities | 65.00% |  |
Maximum | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for plan asset of equity securities | 65.00% |  |
Maximum | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for plan asset of equity securities | 15.00% |  |
Maximum | Other Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation for plan asset of equity securities | 25.00% |  |
Common Stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
ESOP target contribution | 3.00% |  |

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