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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Amortization of actuarial loss $ 22 $ 20 $ 65 $ 57
Huntsman International LLC [Member]        
Amortization of actuarial loss 22 20 67 59
Defined Benefit Plans [Member]        
Service cost 13 13 41 39
Interest cost 13 15 37 46
Expected return on assets (42) (44) (126) (129)
Amortization of prior service benefit (2) (2) (5) (5)
Amortization of actuarial loss 23 21 69 60
Net periodic benefit cost 5 3 19 11
Settlement loss     3 0
Defined Benefit Plans [Member] | Huntsman International LLC [Member]        
Service cost 13 13 41 39
Interest cost 13 15 37 46
Expected return on assets (42) (44) (126) (129)
Amortization of prior service benefit (2) (2) (5) (5)
Amortization of actuarial loss 24 21 71 62
Net periodic benefit cost 6 3 21 13
Settlement loss     3 0
Other Postretirement Benefits Plan [Member]        
Service cost 1 0 1 1
Interest cost 0 1 1 2
Expected return on assets 0 0 0 0
Amortization of prior service benefit (1) (2) (3) (4)
Amortization of actuarial loss 0 1 1 1
Net periodic benefit cost 0 0 0 0
Settlement loss     0 0
Other Postretirement Benefits Plan [Member] | Huntsman International LLC [Member]        
Service cost 1 0 1 1
Interest cost 0 1 1 2
Expected return on assets 0 0 0 0
Amortization of prior service benefit (1) (2) (3) (4)
Amortization of actuarial loss 0 1 1 1
Net periodic benefit cost $ 0 $ 0 0 0
Settlement loss     $ 0 $ 0