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Purchase of Preference Shares - Additional Information (Detail) - 6% and 7% Cumulative Preference Shares [Member] € in Millions	12 Months Ended
	Dec. 31, 2017 EUR (€)
Disclosure of Purchase of Preference Shares [Line Items]
Percentage of preference shares tendered	99.00%
Consideration paid for the repurchase of shares	€ 448
Liability recorded in other financial liabilities	€ 2
Percentage of preference shares for which liability is recorded	1.00%
Difference between consideration paid and carrying value of shares	€ 382

X

- Definition

Consideration paid for repurchase of preference shares.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Difference between consideration paid and carrying value of preference shares.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Disclosure of Purchase of Preference Shares [Line Items]

+ References

No definition available.

+ Details

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X

- Definition

Financial liability in connection with purchase of preference shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	ul_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Percentage of preference shares for which liability is recorded.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of preference shares tendered.

+ References

No definition available.

+ Details

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Namespace Prefix:	ul_
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X

- Details

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Namespace Prefix:
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Period Type: