Quarterly report pursuant to Section 13 or 15(d)

Note 14 - Accumulated Other Comprehensive Loss (Details Textual)

v3.21.1
Note 14 - Accumulated Other Comprehensive Loss (Details Textual) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]        
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Total $ 56 $ 74 $ 56 $ 68
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] | Huntsman International LLC [Member]        
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Total 43 61 43 55
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]        
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Total 148 134 153 148
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member] | Huntsman International LLC [Member]        
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Total 172 160 $ 178 $ 174
Accumulated Defined Benefit Plans Adjustment, Settlement Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax, Total   41    
Accumulated Defined Benefit Plans Adjustment, Settlement Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Huntsman International LLC [Member]        
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax, Total   41    
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]        
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax, Total 2 1    
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Huntsman International LLC [Member]        
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax, Total $ 2 $ 1