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PENSION AND POSTRETIREMENT EMPLOYEE BENEFIT PLANS - Underfunded Plans (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
United States
Underfunded plans having accumulated benefit obligations exceeding the fair value of plan assets
Projected benefit obligation	$ 227	$ 214
Accumulated benefit obligation	227	214
Fair value of plan assets	216	187
Ireland, Germany, and Japan
Underfunded plans having accumulated benefit obligations exceeding the fair value of plan assets
Projected benefit obligation	259	235
Accumulated benefit obligation	251	225
Fair value of plan assets	$ 161	$ 147

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