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BENEFIT PLANS - FAIR VALUE OF PENSION PLAN ASSETS (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | $ 212 | $ 213 | $ 185
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 | 17 | 16 |
Equity securities, International |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 65 | 58 |
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 | 66 | 65 |
Mutual funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 18 | 20 |
Common trusts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets |  | 5 |
Insurance contracts |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 34 | 37 |
Hedge funds |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 11 | 12 |
Real Estate |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | $ 1 |  |
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 |  | 213 |
Level 1 |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | $ 166 | 159 |
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 | 17 | 16 |
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 | 65 | 58 |
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 | 66 | 65 |
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 | 18 | 20 |
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 |
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 1 | Real Estate |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0 |  |
Level 2 |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0 | 5 |
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 |
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 2 | Real Estate |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 0 |  |
Level 3 |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | 46 | 49 | 39
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 |
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 | 34 | 37 | 30
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 | 11 | 12 | 9
Level 3 | Real Estate |  |  |
Schedule of Pension and Other Postretirment Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |
Plan assets | $ 1 | $ 0 | $ 0

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