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v3.25.2

Related party - Schedule of Net Parent Investment (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Related Party Transactions [Abstract] |  |
Net transfers to Parent as reflected on the unaudited condensed consolidated statements of cash flows | $ (91) | $ (204)
Equity contribution from Parent related to the settlement of Related-party notes payable | 1,999 | 0
Other non-cash activities with Parent, net | 25 | 26
Net transfers to Parent | $ 1,933 | $ (178)

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- Definition Equity Contribution From Parent + References No definition available. + Details
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Namespace Prefix: | holcim_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Net Transfers To (From) Parent + References No definition available. + Details
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Namespace Prefix: | holcim_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Other Non-Cash Activities With Parent, Net + References No definition available. + Details
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Namespace Prefix: | holcim_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Transfers To Parent, Net + References No definition available. + Details
Name: | holcim_TransfersToParentNet
Namespace Prefix: | holcim_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration