Huntsman Corporation Annual report pursuant to Section 13 and 15(d)

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

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