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Debt - Narrative (Details) $ in Millions, $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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% |  |  |  |  |  |  |  |  |  |

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