XML 47 R29.htm IDEA: XBRL DOCUMENT
v3.26.1

BASIS OF PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES - Exchange rates (Details) | 6 Months Ended
--- | ---
Jun. 30, 2026 € / £ $ / £ ¥ / £ | Jun. 30, 2025 $ / £ € / £ ¥ / £
USD |  |
Disclosure of Accounting Policies [Line Items] |  |
Average rates | $ / £ | 1.34 | 1.3
Period-end rates | $ / £ | 1.32 | 1.37
Euro |  |
Disclosure of Accounting Policies [Line Items] |  |
Average rates | € / £ | 1.15 | 1.19
Period-end rates | € / £ | 1.16 | 1.17
CNY |  |
Disclosure of Accounting Policies [Line Items] |  |
Average rates | ¥ / £ | 9.24 | 9.42
Period-end rates | ¥ / £ | 8.98 | 9.82

X
- Definition Line items for disclosing information related to accounting policies. + References No definition available. + Details
Name: | hln_DisclosureOfAccountingPoliciesLineItems
Namespace Prefix: | hln_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_AverageForeignExchangeRate
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_ClosingForeignExchangeRate
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_EUR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_CNY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |