Represents the average effective post-swap interest rate of borrowings.

No definition available.

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- Definition

Represents the average effective pre-swap interest rate of borrowings.

+ References

No definition available.

+ Details

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- Definition

Coupon rate, preference shares

+ References

No definition available.

+ Details

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- Definition

Issue price per share.

+ References

No definition available.

+ Details

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- Definition

Number of preference shares issued.

+ References

No definition available.

+ Details

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- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
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-URIDate 2025-03-27

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

The non-current portion of non-current borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from borrowings obtained. [Refer: Borrowings]

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for repayments of bonds, notes and debentures.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2025-01-01
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-URIDate 2025-03-27

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to settle borrowings, classified as financing activities. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2025-01-01
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

Name:	ifrs-full_BorrowingsByNameAxis=hln_NonVotingPreferenceSharesMember
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- Details

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Data Type:	na
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- Details

Name:	ifrs-full_BorrowingsByNameAxis=hln_LongTermNotesInIssueMember
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Data Type:	na
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- Details

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Data Type:	na
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- Details

Name:	ifrs-full_BorrowingsByNameAxis=hln_CnyLongTermBankLoansMember
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BORROWINGS - Long term borrowings (Details) £ / shares in Units, € in Millions, ¥ in Millions, £ in Millions			6 Months Ended
	Mar. 29, 2026 EUR (€)	Jul. 17, 2022 £ / shares shares	Jun. 30, 2026 GBP (£)	Jun. 30, 2025 GBP (£)	Jun. 30, 2026 CNY (¥)	Dec. 31, 2025 GBP (£)	Dec. 31, 2025 CNY (¥)
Borrowings
Non-current			£ 6,290			£ 7,773
Proceeds from borrowings			325	£ 40
Repayment of term loan			737	£ 1,352
Euro Medium Term Note Programme
Borrowings
Redemption of notes \| €	€ 850
Non-voting preference shares
Borrowings
Non-current			25			25
Number of preference shares issued \| shares		25,000,000
Issue price per share \| £ / shares		£ 1
Coupon rate, preference shares		9.50%
Bonds
Borrowings
Non-current			5,871			7,363
Long-term notes in issue
Borrowings
Non-current			£ 5,871			£ 7,363
Average effective pre-swap interest rate			3.20%		3.20%	3.20%	3.20%
Average effective post-swap interest rate			3.10%		3.10%	3.00%	3.00%
Long-term notes in issue \| After five years
Borrowings
Non-current			£ 3,543			£ 3,538
CNY long-term bank loans
Borrowings
Non-current			£ 283		¥ 2,541	£ 300	¥ 2,824
CNY long-term bank loans \| Weighted average
Borrowings
Interest rate			2.90%		2.90%	2.90%	2.90%