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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Components of net periodic benefit cost        
Amortization of actuarial loss $ 18 $ 19 $ 53 $ 55
Contributions to pension and other postretirement benefit plans     74 80
Expected contributions to pension and other postretirement benefit plans during remainder of 2017 23   23  
HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of net periodic benefit cost        
Amortization of actuarial loss 19 20 56 57
Defined Benefit Plans        
Components of net periodic benefit cost        
Service cost 15 16 48 47
Interest cost 21 20 61 59
Expected return on assets (42) (39) (128) (116)
Amortization of prior service benefit (2) (2) (5) (5)
Amortization of actuarial loss 18 19 54 56
Special termination benefits       1
Settlement loss     2  
Net periodic benefit cost 10 14 32 42
Defined Benefit Plans | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of net periodic benefit cost        
Service cost 15 16 48 47
Interest cost 21 20 61 59
Expected return on assets (42) (39) (128) (116)
Amortization of prior service benefit (2) (2) (5) (5)
Amortization of actuarial loss 19 20 57 58
Special termination benefits       1
Settlement loss     2  
Net periodic benefit cost 11 15 35 44
Other Postretirement Benefit Plans        
Components of net periodic benefit cost        
Service cost   1 1 2
Interest cost   1 2 3
Amortization of prior service benefit (1) (2) (4) (5)
Amortization of actuarial loss 1 1 2 2
Net periodic benefit cost   1 1 2
Other Postretirement Benefit Plans | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES        
Components of net periodic benefit cost        
Service cost   1 1 2
Interest cost   1 2 3
Amortization of prior service benefit (1) (2) (4) (5)
Amortization of actuarial loss $ 1 1 2 2
Net periodic benefit cost   $ 1 $ 1 $ 2