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Note 11 - Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2023
Notes to Financial Statements |
Retirement Benefits [Text Block] | 11. EMPLOYEE BENEFIT PLANS ​ Components of the net periodic benefit cost (credit) from continuing operations for the three and nine months ended September 30, 2023 and 2022 were as follows (dollars in millions): ​ Huntsman Corporation ​
|  |  |  |  |  |  |  |  |  | Other postretirement |
|  | Defined benefit plans |  |  | benefit plans |
|  | Three months |  |  | Three months |
|  | ended |  |  | ended |
|  | September 30, |  |  | September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Service cost |  | $ | 6 |  |  | $ | 11 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost |  |  | 24 |  |  |  | 13 |  |  |  | — |  |  |  | — |
Expected return on assets |  |  | (32 | ) |  |  | (37 | ) |  |  | — |  |  |  | — |
Amortization of prior service benefit |  |  | (2 | ) |  |  | (2 | ) |  |  | (2 | ) |  |  | (1 | )
Amortization of actuarial loss |  |  | 9 |  |  |  | 12 |  |  |  | — |  |  |  | — |
Net periodic benefit cost (credit) |  | $ | 5 |  |  | $ | (3 | ) |  | $ | (1 | ) |  | $ | — |
​
|  |  |  |  |  |  |  |  |  | Other postretirement |
|  | Defined benefit plans |  |  | benefit plans |
|  | Nine months |  |  | Nine months |
|  | ended |  |  | ended |
|  | September 30, |  |  | September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Service cost |  | $ | 19 |  |  | $ | 34 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost |  |  | 70 |  |  |  | 41 |  |  |  | 2 |  |  |  | 1 |
Expected return on assets |  |  | (95 | ) |  |  | (113 | ) |  |  | — |  |  |  | — |
Amortization of prior service benefit |  |  | (4 | ) |  |  | (4 | ) |  |  | (4 | ) |  |  | (3 | )
Amortization of actuarial loss |  |  | 25 |  |  |  | 36 |  |  |  | — |  |  |  | 1 |
Net periodic benefit cost (credit) |  | $ | 15 |  |  | $ | (6 | ) |  | $ | (1 | ) |  | $ | — |
Huntsman International ​
|  |  |  |  |  |  |  |  |  | Other postretirement |
|  | Defined benefit plans |  |  | benefit plans |
|  | Three months |  |  | Three months |
|  | ended |  |  | ended |
|  | September 30, |  |  | September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Service cost |  | $ | 6 |  |  | $ | 11 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost |  |  | 24 |  |  |  | 13 |  |  |  | — |  |  |  | — |
Expected return on assets |  |  | (32 | ) |  |  | (37 | ) |  |  | — |  |  |  | — |
Amortization of prior service benefit |  |  | (2 | ) |  |  | (2 | ) |  |  | (2 | ) |  |  | (1 | )
Amortization of actuarial loss |  |  | 9 |  |  |  | 12 |  |  |  | — |  |  |  | — |
Net periodic benefit cost (credit) |  | $ | 5 |  |  | $ | (3 | ) |  | $ | (1 | ) |  | $ | — |
​
|  |  |  |  |  |  |  |  |  | Other postretirement |
|  | Defined benefit plans |  |  | benefit plans |
|  | Nine months |  |  | Nine months |
|  | ended |  |  | ended |
|  | September 30, |  |  | September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Service cost |  | $ | 19 |  |  | $ | 34 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost |  |  | 70 |  |  |  | 41 |  |  |  | 2 |  |  |  | 1 |
Expected return on assets |  |  | (95 | ) |  |  | (113 | ) |  |  | — |  |  |  | — |
Amortization of prior service benefit |  |  | (4 | ) |  |  | (4 | ) |  |  | (4 | ) |  |  | (3 | )
Amortization of actuarial loss |  |  | 25 |  |  |  | 36 |  |  |  | — |  |  |  | 1 |
Net periodic benefit cost (credit) |  | $ | 15 |  |  | $ | (6 | ) |  | $ | (1 | ) |  | $ | — |
During the nine months ended September 30, 2023 and 2022, we made contributions to our pension and other postretirement benefit plans related to continuing operations of $41 million and $35 million, respectively. During the remainder of 2023, we expect to contribute an additional amount of approximately $9 million to these plans. ​

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