v3.26.1
Related party (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 22, 2025
Mar. 31, 2026
Mar. 31, 2025
Related Party Transaction [Line Items]      
Total Revenues   $ 2,178 $ 2,081
Cost of revenues:   1,967 1,859
Selling, general and administrative expenses   292 239
Interest expense   78 132
Interest income   8 14
Interest expense, debt   72 11
Net transfers to holcim   0 89
Other non-cash activities with Parent, net     5
Related Party      
Related Party Transaction [Line Items]      
Total Revenues     25
Cost of revenues:     8
Allocations for management costs     27
Selling, general and administrative expenses     19
Interest expense     1
Interest income     5
Borrowing arrangements $ 7,645    
Interest expense, debt     108
Related Party | Products And Services Purchased From Parent      
Related Party Transaction [Line Items]      
Cost of revenues:     31
Related Party | Related Party Notes Settled Through Dividend      
Related Party Transaction [Line Items]      
Related party, amounts of transaction 5,646    
Related Party | Related Party Notes Settled As Equity Contribution      
Related Party Transaction [Line Items]      
Related party, amounts of transaction $ 1,999    
Equity Method Investee      
Related Party Transaction [Line Items]      
Total Revenues   $ 2 $ 2
Minimum | Related Party      
Related Party Transaction [Line Items]      
Transition services agreement, term   1 year  
Tax matters agreement, term   2 years  
Maximum | Related Party      
Related Party Transaction [Line Items]      
Transition services agreement, term   2 years  
Tax matters agreement, term   5 years