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, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of net periodic benefit cost      
Amortization of actuarial loss $ 66 $ 67 $ 69
HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES      
Components of net periodic benefit cost      
Amortization of actuarial loss 70 71 72
Defined Benefit Plans | United States      
Amounts recognized in accumulated other comprehensive loss:      
Net actuarial loss 394 401  
Prior service credit (11) (13)  
Total 383 388  
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 28    
Prior service credit (2)    
Total 26    
Components of net periodic benefit cost      
Service cost 20 23 22
Interest cost 41 39 39
Expected return on assets (53) (54) (48)
Amortization of prior service benefit (2) (2) (2)
Amortization of actuarial loss 23 31 27
Settlement loss   2  
Net periodic benefit cost (credit) 29 39 38
Defined Benefit Plans | United States | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES      
Amounts recognized in accumulated other comprehensive loss:      
Net actuarial loss 395 402  
Prior service credit (11) (13)  
Total 384 389  
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 28    
Prior service credit (2)    
Total 26    
Components of net periodic benefit cost      
Service cost 20 23 22
Interest cost 41 39 39
Expected return on assets (53) (54) (48)
Amortization of prior service benefit (2) (2) (2)
Amortization of actuarial loss 23 31 27
Settlement loss   2  
Net periodic benefit cost (credit) 29 39 38
Defined Benefit Plans | Non-U.S. Defined Benefit Plans      
Amounts recognized in accumulated other comprehensive loss:      
Net actuarial loss 840 784  
Prior service credit (32) (27)  
Total 808 757  
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 53    
Prior service credit (5)    
Total 48    
Components of net periodic benefit cost      
Service cost 30 32 33
Interest cost 37 37 35
Expected return on assets (102) (109) (100)
Amortization of prior service benefit (4) (5) (5)
Amortization of actuarial loss 45 38 45
Settlement loss 1    
Special termination benefits     1
Net periodic benefit cost (credit) 7 (7) 9
Defined Benefit Plans | Non-U.S. Defined Benefit Plans | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES      
Amounts recognized in accumulated other comprehensive loss:      
Net actuarial loss 846 793  
Prior service credit (31) (27)  
Total 815 766  
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 56    
Prior service credit (5)    
Total 51    
Components of net periodic benefit cost      
Service cost 30 32 33
Interest cost 37 37 35
Expected return on assets (102) (109) (100)
Amortization of prior service benefit (4) (5) (5)
Amortization of actuarial loss 48 41 48
Settlement loss 1    
Special termination benefits     1
Net periodic benefit cost (credit) 10 (4) 12
Other Postretirement Benefit Plans | United States      
Amounts recognized in accumulated other comprehensive loss:      
Net actuarial loss 20 21  
Prior service credit (33) (38)  
Total (13) (17)  
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 1 2 2
Interest cost 3 2 3
Amortization of prior service benefit (5) (5) (6)
Amortization of actuarial loss 1 2 3
Net periodic benefit cost (credit)   1 2
Other Postretirement Benefit Plans | United States | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES      
Amounts recognized in accumulated other comprehensive loss:      
Net actuarial loss 20 21  
Prior service credit (33) (38)  
Total (13) (17)  
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 1 2 2
Interest cost 3 2 3
Amortization of prior service benefit (5) (5) (6)
Amortization of actuarial loss $ 1 2 3
Net periodic benefit cost (credit)   $ 1 $ 2