Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFIT PLANS - AMOUNTS RECOGNIZED AND AMOUNTS EXPECTED TO BE RECOGNIZED IN OTHER COMPREHENSIVE INCOME LOSS AND COMPONENTS OF NET PERIODIC BENEFIT COST (Details)

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EMPLOYEE BENEFIT PLANS - AMOUNTS RECOGNIZED AND AMOUNTS EXPECTED TO BE RECOGNIZED IN OTHER COMPREHENSIVE INCOME LOSS AND COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Components of net periodic benefit cost      
Amortization of actuarial loss $ 71 $ 73 $ 55
HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES      
Components of net periodic benefit cost      
Amortization of actuarial loss 75 76 58
Defined Benefit Plans | United States      
Amounts recognized in accumulated other comprehensive loss:      
Net actuarial loss 401 419  
Prior service credit (13) (15)  
Total 388 404  
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during the next fiscal year      
Actuarial loss 26    
Prior service credit (2)    
Total 24    
Components of net periodic benefit cost      
Service cost 32 30 30
Interest cost 44 44 47
Expected return on assets (61) (55) (54)
Amortization of prior service benefit (2) (2) (5)
Amortization of actuarial loss 34 30 25
Settlement loss 2    
Net periodic benefit cost 49 47 43
Defined Benefit Plans | United States | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES      
Amounts recognized in accumulated other comprehensive loss:      
Net actuarial loss 402   420
Prior service credit (13)   (15)
Total 389   405
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during the next fiscal year      
Actuarial loss 27    
Prior service credit (2)    
Total 25    
Components of net periodic benefit cost      
Service cost 32 30 30
Interest cost 44 44 47
Expected return on assets (61) (55) (54)
Amortization of prior service benefit (2) (2) (5)
Amortization of actuarial loss 34 30 25
Settlement loss 2    
Net periodic benefit cost 49 47 43
Defined Benefit Plans | Non-U.S. Defined Benefit Plans      
Amounts recognized in accumulated other comprehensive loss:      
Net actuarial loss 784 1,000  
Prior service credit (27) (29)  
Total 757 971  
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during the next fiscal year      
Actuarial loss 45    
Prior service credit (4)    
Total 41    
Components of net periodic benefit cost      
Service cost 32 33 29
Interest cost 37 35 41
Expected return on assets (109) (100) (93)
Amortization of prior service benefit (5) (5) (4)
Amortization of actuarial loss 38 45 31
Special termination benefits   1  
Net periodic benefit cost (7) 9 4
Defined Benefit Plans | Non-U.S. Defined Benefit Plans | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES      
Amounts recognized in accumulated other comprehensive loss:      
Net actuarial loss 793 1,030  
Prior service credit (27) (29)  
Total 766 1,001  
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during the next fiscal year      
Actuarial loss 48    
Prior service credit (4)    
Total 44    
Components of net periodic benefit cost      
Service cost 32 33 29
Interest cost 37 35 41
Expected return on assets (109) (100) (93)
Amortization of prior service benefit (5) (5) (4)
Amortization of actuarial loss 41 48 34
Special termination benefits   1  
Net periodic benefit cost (4) 12 7
Other Postretirement Benefit Plans | United States      
Amounts recognized in accumulated other comprehensive loss:      
Net actuarial loss 21 30  
Prior service credit (38) (45)  
Total (17) (15)  
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during the next fiscal year      
Actuarial loss 1    
Prior service credit (5)    
Total (4)    
Components of net periodic benefit cost      
Service cost 2 3 2
Interest cost 3 3 4
Amortization of prior service benefit (6) (6) (7)
Amortization of actuarial loss 2 3 2
Net periodic benefit cost 1 3 1
Other Postretirement Benefit Plans | United States | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES      
Amounts recognized in accumulated other comprehensive loss:      
Net actuarial loss 21 30  
Prior service credit (38) (45)  
Total (17) (15)  
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during the next fiscal year      
Actuarial loss 1    
Prior service credit (5)    
Total (4)    
Components of net periodic benefit cost      
Service cost 2 3 2
Interest cost 3 3 4
Amortization of prior service benefit (6) (6) (7)
Amortization of actuarial loss 2 3 2
Net periodic benefit cost $ 1 $ 3 $ 1