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Guarantor Statements - Additional Information (Detail) - USD ($) $ in Billions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Notes [member]
Supplemental Guarantor Information [line items]
Borrowings outstanding amount	$ 11.0	$ 11.0	$ 9.5
Notes [member] | Bottom of range [member]
Supplemental Guarantor Information [line items]
Interest rate of borrowings	1.375%
Notes [member] | Top of range [member]
Supplemental Guarantor Information [line items]
Interest rate of borrowings	5.90%
UCC and UNUS [member]
Supplemental Guarantor Information [line items]
Ownership percentage	100.00%

X

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard
-URIDate 2018-03-16

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard
-URIDate 2018-03-16

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of ownership by parent entities.

+ References

No definition available.

+ Details

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

X

- Definition

Supplemental Guarantor Information [line items]

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Details

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Namespace Prefix:
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X

- Details

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Period Type:

X

- Details

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X

- Details

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