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PENSION AND POSTRETIREMENT EMPLOYEE BENEFIT PLANS - Underfunded Plans (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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United States |  |
Underfunded plans having accumulated benefit obligations exceeding the fair value of plan assets |  |
Projected benefit obligation | $ 236 | $ 227
Accumulated benefit obligation | 236 | 227
Fair value of plan assets | 231 | 216
Foreign Plan |  |
Underfunded plans having accumulated benefit obligations exceeding the fair value of plan assets |  |
Projected benefit obligation | 294 | 259
Accumulated benefit obligation | 286 | 251
Fair value of plan assets | $ 189 | $ 161

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