ACQUISITIONS	3 Months Ended
Mar. 31, 2019
Business Combinations [Abstract]
Acquisitions	Paroc Acquisition On February 5, 2018, the Company acquired all the outstanding equity of Paroc Group Oy ("Paroc"), a leading producer of mineral wool insulation for building and technical applications in Europe, for $1,121 million, net of cash acquired. The acquisition of Paroc expands the Company's mineral wool technology, grows its presence in the European insulation market, provides access to a variety of new end-use markets and will increase the Insulation segment's geographic sales mix outside of the U.S. and Canada. Paroc's operating results have been included in the Company’s Insulation segment within the Consolidated Financial Statements since the date of the acquisition. During the first three months of 2019, the Consolidated Statements of Earnings included $38 million in Net Sales attributable to the acquisition (related to the one-year post-acquisition period). The pro forma effect of this acquisition on Net sales and Net earnings attributable to Owens Corning was immaterial.

ACQUISITIONS

3 Months Ended

Mar. 31, 2019

Paroc Acquisition

On February 5, 2018, the Company acquired all the outstanding equity of Paroc Group Oy ("Paroc"), a leading producer of mineral wool insulation for building and technical applications in Europe, for $1,121 million, net of cash acquired. The acquisition of Paroc expands the Company's mineral wool technology, grows its presence in the European insulation market, provides access to a variety of new end-use markets and will increase the Insulation segment's geographic sales mix outside of the U.S. and Canada. Paroc's operating results have been included in the Company’s Insulation segment within the Consolidated Financial Statements since the date of the acquisition. During the first three months of 2019, the Consolidated Statements of Earnings included $38 million in Net Sales attributable to the acquisition (related to the one-year post-acquisition period). The pro forma effect of this acquisition on Net sales and Net earnings attributable to Owens Corning was immaterial.