Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Employee Benefit Plans - Components of Net Periodic Benefit Costs (Details)

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Note 12 - Employee Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Amortization of actuarial loss $ 22 $ 18
Huntsman International LLC [Member]    
Amortization of actuarial loss 23 18
Defined Benefit Plans [Member]    
Service cost 14 14
Interest cost 12 15
Expected return on assets (42) (43)
Amortization of prior service benefit (2) (2)
Amortization of actuarial loss 23 20
Settlement loss 3 0
Net periodic benefit cost 8 4
Defined Benefit Plans [Member] | Huntsman International LLC [Member]    
Service cost 14 14
Interest cost 12 15
Expected return on assets (42) (43)
Amortization of prior service benefit (2) (2)
Amortization of actuarial loss 24 21
Settlement loss 3 0
Net periodic benefit cost 9 5
Other Postretirement Benefits Plan [Member]    
Service cost 0 0
Interest cost 0 1
Expected return on assets 0 0
Amortization of prior service benefit (1) (1)
Amortization of actuarial loss 1 0
Settlement loss 0 0
Net periodic benefit cost 0 0
Other Postretirement Benefits Plan [Member] | Huntsman International LLC [Member]    
Service cost 0 0
Interest cost 0 1
Expected return on assets 0 0
Amortization of prior service benefit (1) (1)
Amortization of actuarial loss 1 0
Settlement loss 0 0
Net periodic benefit cost $ 0 $ 0