Debt Instrument, Number Of Tranches

No definition available.

Name:	holcim_DebtInstrumentNumberOfTranches
Namespace Prefix:	holcim_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Variable Rate, Floor

+ References

No definition available.

+ Details

Name:	holcim_DebtInstrumentVariableRateFloor
Namespace Prefix:	holcim_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Other Long-Term Debt, Fair Value

+ References

No definition available.

+ Details

Name:	holcim_OtherLongTermDebtFairValue
Namespace Prefix:	holcim_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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

- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (e)
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- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
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-Topic 852
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Debt - Narrative (Details) $ in Millions, $ in Millions				3 Months Ended		6 Months Ended
Debt - Narrative (Details) $ in Millions, $ in Millions	Apr. 08, 2025 USD ($)	Apr. 07, 2025 USD ($) tranche	Mar. 24, 2025 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 CAD ($)	Jun. 18, 2025 USD ($)	May 19, 2025 USD ($)	May 15, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 22, 2016 USD ($)
Debt Instrument [Line Items]
Interest expense, debt				$ 54	$ 10	$ 65	$ 21
Interest income				22	4	36	15
Net proceeds from note offering after deductions for discounts and related debt issuance costs						3,398	0
Payments of debt issuance costs						24	0
Short term debt outstanding				931		931						$ 0
Nonrelated Party
Debt Instrument [Line Items]
Interest income				15	$ 2	24	$ 10
Deduction for fees and discounts				(1)		(1)						13
Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				60		60		$ 40
Standby Letters of Credit
Debt Instrument [Line Items]
Remaining borrowing capacity				138		138						$ 213
The Bridge Loan \| Bridge Loan
Debt Instrument [Line Items]
Debt instrument, term			364 days
Line of credit facility, maximum borrowing capacity			$ 5,100
Remaining borrowing capacity	$ 1,700
The Commerical Paper Program \| Commercial Paper
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity											$ 2,000
Short term debt outstanding				$ 930		$ 930
Weighted average interest rate				4.71%		4.71%		4.71%
Fair Value, Inputs, Level 1
Debt Instrument [Line Items]
Long-term debt, fair value				$ 5,332		$ 5,332
Other long-term debt, fair value				$ 61		$ 61
Senior Notes \| 3.500% New Exchange Notes \| Amrize Finance US LLC
Debt Instrument [Line Items]
Debt face amount										$ 400
Senior Notes \| 4.750% New Exchange Notes \| Amrize Finance US LLC
Debt Instrument [Line Items]
Debt face amount										$ 590
Senior Notes \| 7.125% New Exchange Notes \| Subsidiary of Parent
Debt Instrument [Line Items]
Debt instrument, interest rate										7.125%
Debt face amount										$ 483
Senior Notes \| 4.200% New Exchange Notes \| Subsidiary of Parent
Debt Instrument [Line Items]
Debt instrument, interest rate										4.20%
Debt face amount										$ 50
Senior Notes \| 6.875% New Exchange Notes \| Subsidiary of Parent
Debt Instrument [Line Items]
Debt instrument, interest rate										6.875%
Debt face amount										$ 250
Senior Notes \| 6.500% New Exchange Notes \| Subsidiary of Parent
Debt Instrument [Line Items]
Debt instrument, interest rate										6.50%
Debt face amount										$ 250
Senior Notes \| Original Exchange Notes \| Amrize Finance US LLC
Debt Instrument [Line Items]
Debt face amount									$ 880
Senior Notes \| Original Exchange Notes \| Subsidiary of Parent
Debt Instrument [Line Items]
Debt face amount									925
Senior Notes \| New Exchange Notes
Debt Instrument [Line Items]
Debt face amount									1,805
Senior Notes \| Bonds Due 2031
Debt Instrument [Line Items]
Debt face amount										$ 50
Senior Notes \| Senior Unsecured Notes "Notes"
Debt Instrument [Line Items]
Net proceeds from note offering after deductions for discounts and related debt issuance costs	$ 3,400
Senior Notes \| Senior Unsecured Notes "Notes" \| Amrize Finance US LLC
Debt Instrument [Line Items]
Debt face amount		$ 3,400
Debt instrument, number of tranches \| tranche		4
Net proceeds from note offering after deductions for discounts and related debt issuance costs		$ 3,381
Deduction for fees and discounts		6
Payments of debt issuance costs		$ 13
Senior Notes \| 4.600% Unsecured Notes due 2027 \| Amrize Finance US LLC
Debt Instrument [Line Items]
Debt instrument, interest rate		4.60%
Debt face amount		$ 700
Debt instrument, term		2 years
Senior Notes \| 4.700% Unsecured Notes due 2028 \| Amrize Finance US LLC
Debt Instrument [Line Items]
Debt instrument, interest rate		4.70%
Debt face amount		$ 700
Debt instrument, term		3 years
Senior Notes \| 4.950% Unsecured Notes due 2030 \| Amrize Finance US LLC
Debt Instrument [Line Items]
Debt instrument, interest rate		4.95%
Debt face amount		$ 1,000
Debt instrument, term		5 years
Senior Notes \| 5.400% Unsecured Notes due 2035 \| Amrize Finance US LLC
Debt Instrument [Line Items]
Debt instrument, interest rate		5.40%
Debt face amount		$ 1,000
Debt instrument, term		10 years
Senior Notes \| 3.500% Unsecured Notes due 2026 \| Amrize Finance US LLC
Debt Instrument [Line Items]
Debt instrument, interest rate										3.50%
Senior Notes \| 4.750% Unsecured Notes due 2046 \| Amrize Finance US LLC
Debt Instrument [Line Items]
Debt instrument, interest rate				4.75%		4.75%		4.75%
Unsecured Debt \| Original Exchange Notes \| Amrize Finance US LLC
Debt Instrument [Line Items]
Debt face amount									$ 880
Unsecured Debt \| 4.600% Unsecured Notes due 2027
Debt Instrument [Line Items]
Debt instrument, interest rate				4.60%		4.60%		4.60%
Unsecured Debt \| 4.700% Unsecured Notes due 2028
Debt Instrument [Line Items]
Debt instrument, interest rate				4.70%		4.70%		4.70%
Unsecured Debt \| 4.950% Unsecured Notes due 2030
Debt Instrument [Line Items]
Debt instrument, interest rate				4.95%		4.95%		4.95%
Unsecured Debt \| 5.400% Unsecured Notes due 2035
Debt Instrument [Line Items]
Debt instrument, interest rate				5.40%		5.40%		5.40%
Unsecured Debt \| 3.500% Unsecured Notes due 2026
Debt Instrument [Line Items]
Debt instrument, interest rate				3.50%		3.50%		3.50%					3.50%
Debt face amount													$ 400
Unsecured Debt \| 4.750% Unsecured Notes due 2046
Debt Instrument [Line Items]
Debt instrument, interest rate				4.75%		4.75%		4.75%					4.75%
Debt face amount													$ 590
Unsecured Debt \| Fair Value, Inputs, Level 1
Debt Instrument [Line Items]
Long-term debt, fair value				$ 5,271		$ 5,271
Line of Credit \| The Revolving Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, term			5 years
Line of credit facility, maximum borrowing capacity			$ 2,000
Line of Credit \| The Revolving Credit Facility \| Revolving Credit Facility \| Fed Funds Effective Rate Overnight Index Swap Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			0.50%
Line of Credit \| The Revolving Credit Facility \| Revolving Credit Facility \| Overnight Bank Funding Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			0.50%
Line of Credit \| The Revolving Credit Facility \| Revolving Credit Facility \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			1.00%
Debt instrument, variable rate, floor			0.00%
Line of Credit \| The Revolving Credit Facility \| Revolving Credit Facility \| Canadian Overnight Repo Rate Average
Debt Instrument [Line Items]
Debt instrument, variable rate, floor			0.00%