v3.26.1
Commitments and guarantees (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
IfrsStatementLineItems [Line Items]    
Guarantee $ 1,367 $ 1,301
Restricted cash
Liability
Associatesa And Joint Ventures [Member]    
IfrsStatementLineItems [Line Items]    
Guarantee 233 210
Restricted cash
Liability
Assets Retirement Obligations [Member]    
IfrsStatementLineItems [Line Items]    
Guarantee 1,134 1,091
Restricted cash
Liability