Quarterly report pursuant to Section 13 or 15(d)

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

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ACCUMULATED OTHER COMPREHENSIVE LOSS - COMPONENTS AND CHANGES IN ACCUMULATED OTHER COMPREHENSIVE LOSS - HUNTSMAN INTERNATIONAL (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Components of other comprehensive income            
Acquisition of noncontrolling interests, net of tax   $ (79)        
HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES            
Components of other comprehensive income            
Balance at the beginning of the period $ 3,369 2,676 $ 2,772 $ 2,488 $ 2,488  
Acquisition of noncontrolling interests, net of tax   (79)        
Balance at the end of the period 3,426 2,575 3,426 2,575 2,772 $ 2,488
Total            
Components of other comprehensive income            
Other comprehensive (loss) income before reclassifications, gross     (34) (20)    
Tax benefit     (2) (1)    
Amounts reclassified from accumulated other comprehensive loss, gross     93 46    
Tax expense     (21) (10)    
Net current-period other comprehensive (loss) income     36 15    
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     (34) (21)    
Tax benefit     (2) (1)    
Amounts reclassified from accumulated other comprehensive loss, gross     95 48    
Tax expense     (21) (10)    
Net current-period other comprehensive (loss) income     38 16    
Balance at the end of the period (1,340) (1,328) (1,340) (1,328) (1,378) (1,344)
Foreign currency translation adjustment            
Components of other comprehensive income            
Other comprehensive (loss) income before reclassifications, gross     (42) (19)    
Tax benefit       (1)    
Net current-period other comprehensive (loss) income     (42) (20)    
Foreign currency translation adjustment, tax     68 72 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     (42) (20)    
Tax benefit       (1)    
Net current-period other comprehensive (loss) income     (42) (21)    
Balance at the end of the period (416) (397) (416) (397) (374) (376)
Foreign currency translation adjustment, tax     55 59 55 57
Pension and other postretirement benefits adjustments            
Components of other comprehensive income            
Other comprehensive (loss) income before reclassifications, gross     8      
Tax benefit     (2)      
Amounts reclassified from accumulated other comprehensive loss, gross 18 15 93 46    
Tax expense (4) (4) (21) (10)    
Net current-period other comprehensive (loss) income     78 36    
Pension and other postretirement benefits adjustments, tax     125 125 148 135
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      
Tax benefit     (2)      
Amounts reclassified from accumulated other comprehensive loss, gross 19 15 95 48    
Tax expense (4) (3) (21) (10)    
Net current-period other comprehensive (loss) income     80 38    
Balance at the end of the period (932) (939) (932) (939) (1,012) (977)
Pension and other postretirement benefits adjustments, tax     150 151 174 161
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 8 8
Other, net            
Components of other comprehensive income            
Other comprehensive (loss) income before reclassifications, gross       (1)    
Net current-period other comprehensive (loss) income       (1)    
Other, net | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES            
Components of other comprehensive income            
Balance at the beginning of the period       1 1  
Other comprehensive (loss) income before reclassifications, gross       (1)    
Net current-period other comprehensive (loss) income       (1)    
Balance at the end of the period           1
Amounts attributable to noncontrolling interests            
Components of other comprehensive income            
Other comprehensive (loss) income before reclassifications, gross     (3) 6    
Net current-period other comprehensive (loss) income     (3) 6    
Acquisition of noncontrolling interests, net of tax       (15)    
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     (3) 6    
Net current-period other comprehensive (loss) income     (3) 6    
Acquisition of noncontrolling interests, net of tax       (15)    
Balance at the end of the period 23 27 23 27 26 36
Accumulated other comprehensive loss            
Components of other comprehensive income            
Other comprehensive (loss) income before reclassifications, gross     (37) (14)    
Tax benefit     (2) (1)    
Amounts reclassified from accumulated other comprehensive loss, gross     93 46    
Tax expense     (21) (10)    
Net current-period other comprehensive (loss) income     33 21    
Acquisition of noncontrolling interests, net of tax       (15)    
Accumulated other comprehensive loss | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES            
Components of other comprehensive income            
Balance at the beginning of the period (1,343) (1,262) (1,352) (1,308) (1,308)  
Other comprehensive (loss) income before reclassifications, gross     (37) (15)    
Tax benefit     (2) (1)    
Amounts reclassified from accumulated other comprehensive loss, gross     95 48    
Tax expense     (21) (10)    
Net current-period other comprehensive (loss) income     35 22    
Acquisition of noncontrolling interests, net of tax       (15)    
Balance at the end of the period $ (1,317) $ (1,301) $ (1,317) $ (1,301) $ (1,352) $ (1,308)