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BENEFIT PLANS - FAIR VALUE OF PENSION PLAN ASSETS (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | $ 213 | $ 185 | $ 173
Cash and cash equivalents |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 16 | 13 |
Equity securities, International |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 58 | 56 |
Fixed income securities, Fixed rate bonds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 65 | 55 |
Mutual funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 20 | 18 |
Common trusts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 5 | 4 |
Insurance contracts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 37 | 30 |
Hedge funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | $ 12 | 9 |
Equity | Mutual funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Percentage of investments | 50.00% |  |
Equity | Common trusts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Percentage of investments | 65.00% |  |
Fixed Income Investments | Mutual funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Percentage of investments | 50.00% |  |
Fixed Income Investments | Common trusts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Percentage of investments | 35.00% |  |
Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets |  | 185 |
Level 1 |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | $ 159 | 142 |
Level 1 | Cash and cash equivalents |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 16 | 13 |
Level 1 | Equity securities, International |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 58 | 56 |
Level 1 | Fixed income securities, Fixed rate bonds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 65 | 55 |
Level 1 | Mutual funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 20 | 18 |
Level 1 | Common trusts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 1 | Insurance contracts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 1 | Hedge funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 2 |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 5 | 4 |
Level 2 | Cash and cash equivalents |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 2 | Equity securities, International |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 2 | Fixed income securities, Fixed rate bonds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 2 | Mutual funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 2 | Common trusts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 5 | 4 |
Level 2 | Insurance contracts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 2 | Hedge funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 3 |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 49 | 39 | 35
Level 3 | Cash and cash equivalents |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 3 | Equity securities, International |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 3 | Fixed income securities, Fixed rate bonds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 3 | Mutual funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 3 | Common trusts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 3 | Insurance contracts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 37 | 30 | 28
Level 3 | Hedge funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | $ 12 | $ 9 | $ 7

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