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Employee Benefits - Weighted Average Assumptions Used to Determine Postretirement Benefit Expense and Obligation (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Liability [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.60%	3.30%
Current medical cost trend rate	7.00%	7.25%
Ultimate medical cost trend rate	4.75%	4.75%
Expense [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.30%	4.30%
Current medical cost trend rate	7.25%	7.50%
Ultimate medical cost trend rate	4.75%	4.75%

X

- Definition

The current medical cost trend rate utilized to determine postretirement benefit expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	iff_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

Ultimate trend rate for health care cost for defined benefit postretirement plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

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Period Type:	instant

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- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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