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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Other postretirement benefit plan assets (Details) - Other postretirement benefit plans - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets | $ 176 | $ 373 | $ 419
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets | 10 | 43 |
Equity Securities, US based companies |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets | 73 | 133 |
Equity Securities, International based companies |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets | 4 | 4 |
Government bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets | 14 | 12 |
Corporate bonds and debt securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets | 7 | 71 |
Mutual, pooled and commingled funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets | 39 | 86 |
Hedge funds/limited partnerships |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets | 18 | 14 |
Real estate |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets | 6 | 6 |
Other |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets | $ 5 | $ 4 |

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