Quarterly report pursuant to Section 13 or 15(d)

EMPLOYEE BENEFIT PLANS (Details)

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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Components of net periodic benefit cost        
Amortization of actuarial loss $ 18 $ 17 $ 35 $ 36
Contributions to pension and other postretirement benefit plans     46 29
Expected contributions to pension and other postretirement benefit plans during remainder of 2017 51   51  
HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of net periodic benefit cost        
Amortization of actuarial loss 17 17 37 37
Defined Benefit Plans        
Components of net periodic benefit cost        
Service cost 16 16 33 31
Interest cost 20 19 40 39
Expected return on assets (43) (39) (86) (77)
Amortization of prior service benefit (1) (1) (3) (3)
Amortization of actuarial loss 18 19 36 37
Special termination benefits       1
Settlement loss   1 2  
Net periodic benefit cost 10 15 22 28
Defined Benefit Plans | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of net periodic benefit cost        
Service cost 16 16 33 31
Interest cost 20 19 40 39
Expected return on assets (43) (39) (86) (77)
Amortization of prior service benefit (1) (1) (3) (3)
Amortization of actuarial loss 19 19 38 38
Special termination benefits       1
Settlement loss   1 2  
Net periodic benefit cost 11 15 24 29
Other Postretirement Benefit Plans        
Components of net periodic benefit cost        
Service cost     1 1
Interest cost 1 1 2 2
Amortization of prior service benefit (2) (1) (3) (3)
Amortization of actuarial loss 1   1 1
Net periodic benefit cost     1 1
Other Postretirement Benefit Plans | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of net periodic benefit cost        
Service cost     1 1
Interest cost 1 1 2 2
Amortization of prior service benefit (2) $ (1) (3) (3)
Amortization of actuarial loss $ 1   1 1
Net periodic benefit cost     $ 1 $ 1