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, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Balance at the beginning of the period $ 2,488 $ 2,834 $ 2,834  
Revised beginning balance       $ 2,834
Balance at the end of the period 2,640 3,279 2,488 2,834
Total        
Components of other comprehensive income        
Other comprehensive (loss) income before reclassifications, gross 40 81    
Tax benefit 2 1    
Amounts reclassified from accumulated other comprehensive loss, gross 15 22    
Tax benefit (expense) (3) (1)    
Net current-period other comprehensive income (loss) 54 103    
Total | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Balance at the beginning of the period (1,344) (1,406) (1,406)  
Revised beginning balance   (1,416)    
Other comprehensive (loss) income before reclassifications, gross 40 80    
Tax benefit 1 3    
Amounts reclassified from accumulated other comprehensive loss, gross 16 22    
Tax benefit (expense) (3)      
Net current-period other comprehensive income (loss) 54 105    
Balance at the end of the period (1,290) (1,311) (1,344) (1,406)
Foreign currency translation adjustment        
Components of other comprehensive income        
Other comprehensive (loss) income before reclassifications, gross 40 83    
Tax benefit 2 4    
Net current-period other comprehensive income (loss) 42 87    
Foreign currency translation adjustment, tax 69 61 71 (65)
Foreign currency translation adjustment | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Balance at the beginning of the period (376) (252) (252)  
Revised beginning balance   (252)    
Other comprehensive (loss) income before reclassifications, gross 40 81    
Tax benefit 1 4    
Net current-period other comprehensive income (loss) 41 85    
Balance at the end of the period (335) (167) (376) (252)
Foreign currency translation adjustment, tax 56 48 57 51
Pension and other postretirement benefits adjustments        
Components of other comprehensive income        
Other comprehensive (loss) income before reclassifications, gross   (2)    
Amounts reclassified from accumulated other comprehensive loss, gross 15 22    
Tax benefit (expense) (3) 5    
Net current-period other comprehensive income (loss) 12 25    
Pension and other postretirement benefits adjustments, tax 132 177 135 172
Pension and other postretirement benefits adjustments | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Balance at the beginning of the period (977) (1,174) (1,174)  
Revised beginning balance   (1,174)    
Other comprehensive (loss) income before reclassifications, gross   (2)    
Amounts reclassified from accumulated other comprehensive loss, gross 16 22    
Tax benefit (expense) (3) 5    
Net current-period other comprehensive income (loss) 13 25    
Balance at the end of the period (964) (1,149) (977) (1,174)
Pension and other postretirement benefits adjustments, tax 158 204 161 199
Other comprehensive income of unconsolidated affiliates | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Balance at the beginning of the period 8 3 3  
Revised beginning balance   3    
Other comprehensive (loss) income before reclassifications, gross   1    
Net current-period other comprehensive income (loss)   1    
Balance at the end of the period 8 4 8 3
Other, net        
Components of other comprehensive income        
Tax benefit   (3)    
Tax benefit (expense)   (6)    
Net current-period other comprehensive income (loss)   (9)    
Other, net | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Balance at the beginning of the period 1 17 17  
Revised beginning balance   7    
Tax benefit   (1)    
Tax benefit (expense)   (5)    
Net current-period other comprehensive income (loss)   (6)    
Balance at the end of the period 1 1 1 17
Amounts attributable to noncontrolling interests        
Components of other comprehensive income        
Other comprehensive (loss) income before reclassifications, gross (2) (7)    
Net current-period other comprehensive income (loss) (2) (7)    
Disposition of a portion of Venator   (16)    
Amounts attributable to noncontrolling interests | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Balance at the beginning of the period 36 143 143  
Revised beginning balance   143    
Other comprehensive (loss) income before reclassifications, gross (2) (7)    
Net current-period other comprehensive income (loss) (2) (7)    
Disposition of a portion of Venator   (16)    
Balance at the end of the period 34 120 36 143
Accumulated other comprehensive (loss) income        
Components of other comprehensive income        
Cumulative effect of changes in fair value of equity investments       (10)
Other comprehensive (loss) income before reclassifications, gross 38 74    
Tax benefit 2 1    
Amounts reclassified from accumulated other comprehensive loss, gross 15 22    
Tax benefit (expense) (3) (1)    
Net current-period other comprehensive income (loss) 52 96    
Disposition of a portion of Venator   (16)    
Accumulated other comprehensive (loss) income | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Balance at the beginning of the period (1,308) (1,263) (1,263)  
Cumulative effect of changes in fair value of equity investments       (10)
Revised beginning balance   (1,273)   (1,273)
Other comprehensive (loss) income before reclassifications, gross 38 73    
Tax benefit 1 3    
Amounts reclassified from accumulated other comprehensive loss, gross 16 22    
Tax benefit (expense) (3)      
Net current-period other comprehensive income (loss) 52 98    
Disposition of a portion of Venator   (16)    
Balance at the end of the period $ (1,256) (1,191) $ (1,308) $ (1,263)
ASU 2016-01 | Total        
Components of other comprehensive income        
Cumulative effect of changes in fair value of equity investments   (10)    
ASU 2016-01 | Total | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Cumulative effect of changes in fair value of equity investments   (10)    
ASU 2016-01 | Other, net        
Components of other comprehensive income        
Cumulative effect of changes in fair value of equity investments   (10)    
ASU 2016-01 | Other, net | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Cumulative effect of changes in fair value of equity investments   (10)    
ASU 2016-01 | Accumulated other comprehensive (loss) income        
Components of other comprehensive income        
Cumulative effect of changes in fair value of equity investments   (10)    
ASU 2016-01 | Accumulated other comprehensive (loss) income | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of other comprehensive income        
Cumulative effect of changes in fair value of equity investments   $ (10)