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Consolidated Statement of Changes in Equity (Parenthetical)	6 Months Ended
	Jun. 30, 2019 shares
NV Member
Number of shares cancelled	170,000,000
PLC Member
Number of shares cancelled	18,660,634

X

- Definition

Cancelled shares.

+ References

No definition available.

+ Details

Name:	ul_CancelledShares
Namespace Prefix:	ul_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ul_NvMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ul_PlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: