Annual report pursuant to Section 13 and 15(d)

Note 19 - Employee Benefit Plans - Components of Net Benefit Costs (Details)

v3.20.4
Note 19 - Employee Benefit Plans - Components of Net Benefit Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Amortization of actuarial loss $ 76 $ 66 $ 67
Huntsman International LLC [Member]      
Amortization of actuarial loss 79 70 71
UNITED STATES | Pension Plan [Member]      
Service cost 21 20 23
Interest cost 37 41 39
Expected return on plan assets (59) (53) (54)
Amortization of prior service credit (2) (2) (2)
Amortization of actuarial loss 28 23 31
Settlement loss 0 0 2
Net periodic benefit cost (credit) 25 29 39
UNITED STATES | Pension Plan [Member] | Huntsman International LLC [Member]      
Service cost 21 20 23
Interest cost 37 41 39
Expected return on plan assets (59) (53) (54)
Amortization of prior service credit (2) (2) (2)
Amortization of actuarial loss 28 23 31
Settlement loss 0 0 2
Net periodic benefit cost (credit) 25 29 39
UNITED STATES | Other Postretirement Benefits Plan [Member]      
Service cost 1 1 2
Interest cost 2 3 2
Amortization of prior service credit (5) (5) (5)
Amortization of actuarial loss 1 1 2
Net periodic benefit cost (credit) (1) 0 1
UNITED STATES | Other Postretirement Benefits Plan [Member] | Huntsman International LLC [Member]      
Service cost 1 1 2
Interest cost 2 3 2
Amortization of prior service credit (5) (5) (5)
Amortization of actuarial loss 1 1 2
Net periodic benefit cost (credit) (1) 0 1
Foreign Plan [Member] | Pension Plan [Member]      
Service cost 31 30 32
Interest cost 25 37 37
Expected return on plan assets (114) (102) (109)
Amortization of prior service credit (5) (4) (5)
Amortization of actuarial loss 53 45 38
Settlement loss 0 1 0
Net periodic benefit cost (credit) (10) 7 (7)
Foreign Plan [Member] | Pension Plan [Member] | Huntsman International LLC [Member]      
Service cost 31 30 32
Interest cost 25 37 37
Expected return on plan assets (114) (102) (109)
Amortization of prior service credit (5) (4) (5)
Amortization of actuarial loss 57 48 41
Settlement loss 0 1 0
Net periodic benefit cost (credit) (6) 10 (4)
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]      
Service cost 0 0 0
Interest cost 0 0 0
Amortization of prior service credit 0 0 0
Amortization of actuarial loss 0 0 0
Net periodic benefit cost (credit) 0 0 0
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member] | Huntsman International LLC [Member]      
Service cost 0 0 0
Interest cost 0 0 0
Amortization of prior service credit 0 0 0
Amortization of actuarial loss 0 0 0
Net periodic benefit cost (credit) $ 0 $ 0 $ 0