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SEGMENT INFORMATION (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
segment
Mar. 31, 2019
USD ($)
Segment Reporting, Significant Reconciling Item [Line Items]    
Number of reportable segments | segment 3  
NET SALES $ 1,601 $ 1,667
EBIT (866) 118
Restructuring (costs) / gains (5) 2
Gains on sales of certain precious metals 10 0
Goodwill impairment charge 944 0
Intangible asset impairment charges 43 0
General corporate expense and other (31) (30)
Decrease in assets (987)  
U.S.    
Segment Reporting, Significant Reconciling Item [Line Items]    
NET SALES 1,060 1,100
Europe    
Segment Reporting, Significant Reconciling Item [Line Items]    
NET SALES 287 296
Asia Pacific    
Segment Reporting, Significant Reconciling Item [Line Items]    
NET SALES 128 149
Other Geographical    
Segment Reporting, Significant Reconciling Item [Line Items]    
NET SALES 126 122
Composites    
Segment Reporting, Significant Reconciling Item [Line Items]    
NET SALES 494 513
EBIT 44 57
Insulation    
Segment Reporting, Significant Reconciling Item [Line Items]    
NET SALES 603 591
EBIT 39 15
Goodwill impairment charge 944  
Roofing    
Segment Reporting, Significant Reconciling Item [Line Items]    
NET SALES 555 614
EBIT 64 74
Total Segments    
Segment Reporting, Significant Reconciling Item [Line Items]    
NET SALES 1,652 1,718
EBIT 147 146
Corporate Eliminations    
Segment Reporting, Significant Reconciling Item [Line Items]    
NET SALES (51) (51)
EBIT $ (1,013) $ (28)