Quarterly report pursuant to Section 13 or 15(d)

OTHER COMPREHENSIVE INCOME - COMPONENTS AND CHANGES IN ACCUMULATED OTHER COMPREHENSIVE LOSS - HUNTSMAN INTERNATIONAL (Details)

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OTHER COMPREHENSIVE INCOME - COMPONENTS AND CHANGES IN ACCUMULATED OTHER COMPREHENSIVE LOSS - HUNTSMAN INTERNATIONAL (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Components of other comprehensive income        
Other comprehensive income, net of tax $ (21) $ 54    
HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Balance at the beginning of the period 2,772 2,488 $ 2,488  
Other comprehensive income, net of tax (20) 54    
Balance at the end of the period 3,428 2,640 2,772 $ 2,488
Total        
Components of other comprehensive income        
Other comprehensive (loss) income before reclassifications, gross (59) 40    
Tax benefit (6) 2    
Amounts reclassified from accumulated other comprehensive loss, gross 58 15    
Tax benefit (expense) (14) (3)    
Other comprehensive income, net of tax (21) 54    
Total | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Balance at the beginning of the period (1,378) (1,344) (1,344)  
Other comprehensive (loss) income before reclassifications, gross (59) 40    
Tax benefit (6) 1    
Amounts reclassified from accumulated other comprehensive loss, gross 59 16    
Tax benefit (expense) (14) (3)    
Other comprehensive income, net of tax (20) 54    
Balance at the end of the period (1,398) (1,290) (1,378) (1,344)
Foreign currency translation adjustment        
Components of other comprehensive income        
Other comprehensive (loss) income before reclassifications, gross (67) 40    
Tax benefit (6) 2    
Other comprehensive income, net of tax (73) 42    
Foreign currency translation adjustment, tax 74 69 68 71
Foreign currency translation adjustment | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Balance at the beginning of the period (374) (376) (376)  
Other comprehensive (loss) income before reclassifications, gross (67) 40    
Tax benefit (6) 1    
Other comprehensive income, net of tax (73) 41    
Balance at the end of the period (447) (335) (374) (376)
Foreign currency translation adjustment, tax 61 56 55 57
Pension and other postretirement benefits adjustments        
Components of other comprehensive income        
Other comprehensive (loss) income before reclassifications, gross 8      
Amounts reclassified from accumulated other comprehensive loss, gross 58 15    
Tax benefit (expense) (14) (3)    
Other comprehensive income, net of tax 52 12    
Pension and other postretirement benefits adjustments, tax 134 132 148 135
Pension and other postretirement benefits adjustments | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Balance at the beginning of the period (1,012) (977) (977)  
Other comprehensive (loss) income before reclassifications, gross 8      
Amounts reclassified from accumulated other comprehensive loss, gross 59 16    
Tax benefit (expense) (14) (3)    
Other comprehensive income, net of tax 53 13    
Balance at the end of the period (959) (964) (1,012) (977)
Pension and other postretirement benefits adjustments, tax 160 158 174 161
Other comprehensive income of unconsolidated affiliates | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Balance at the beginning of the period 8 8 8  
Balance at the end of the period 8 8 8 8
Other, net | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Balance at the beginning of the period   1 1  
Balance at the end of the period   1   1
Amounts attributable to noncontrolling interests        
Components of other comprehensive income        
Other comprehensive (loss) income before reclassifications, gross   (2)    
Other comprehensive income, net of tax   (2)    
Amounts attributable to noncontrolling interests | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Balance at the beginning of the period 26 36 36  
Other comprehensive (loss) income before reclassifications, gross   (2)    
Other comprehensive income, net of tax   (2)    
Balance at the end of the period 26 34 26 36
Accumulated other comprehensive loss        
Components of other comprehensive income        
Other comprehensive (loss) income before reclassifications, gross (59) 38    
Tax benefit (6) 2    
Amounts reclassified from accumulated other comprehensive loss, gross 58 15    
Tax benefit (expense) (14) (3)    
Other comprehensive income, net of tax (21) 52    
Accumulated other comprehensive loss | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Balance at the beginning of the period (1,352) (1,308) (1,308)  
Other comprehensive (loss) income before reclassifications, gross (59) 38    
Tax benefit (6) 1    
Amounts reclassified from accumulated other comprehensive loss, gross 59 16    
Tax benefit (expense) (14) (3)    
Other comprehensive income, net of tax (20) 52    
Balance at the end of the period $ (1,372) $ (1,256) $ (1,352) $ (1,308)