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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Amortization of actuarial loss $ 21 $ 19 $ 43 $ 37
Huntsman International LLC [Member]        
Amortization of actuarial loss 22 21 45 39
Defined Benefit Plans [Member]        
Service cost 14 12 28 26
Interest cost 12 16 24 31
Expected return on assets (42) (42) (84) (85)
Amortization of prior service benefit (1) (1) (3) (3)
Amortization of actuarial loss 23 19 46 39
Net periodic benefit cost 6 4 14 8
Settlement loss     3 0
Defined Benefit Plans [Member] | Huntsman International LLC [Member]        
Service cost 14 12 28 26
Interest cost 12 16 24 31
Expected return on assets (42) (42) (84) (85)
Amortization of prior service benefit (1) (1) (3) (3)
Amortization of actuarial loss 23 20 47 41
Net periodic benefit cost 6 5 15 10
Settlement loss     3 0
Other Postretirement Benefits Plan [Member]        
Service cost 0 1 0 1
Interest cost 1 0 1 1
Expected return on assets 0 0 0 0
Amortization of prior service benefit (1) (1) (2) (2)
Amortization of actuarial loss 0 0 1 0
Net periodic benefit cost 0 0 0 0
Settlement loss     0 0
Other Postretirement Benefits Plan [Member] | Huntsman International LLC [Member]        
Service cost 0 1 0 1
Interest cost 1 0 1 1
Expected return on assets 0 0 0 0
Amortization of prior service benefit (1) (1) (2) (2)
Amortization of actuarial loss 0 0 1 0
Net periodic benefit cost $ 0 $ 0 0 0
Settlement loss     $ 0 $ 0