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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On January 2, 2019, Westlake acquired NAKAN, a global compounding solutions business, and paid approximately $250 as the base purchase price, subject to post-closing adjustments. NAKAN's products are used in a wide-variety of applications, including in the automotive, building and construction, and medical industries.