Financial and capital risk management (Details 5) $ in Millions	Jun. 30, 2025 USD ($)
Depreciation [Member] \| Risk Depreciation Price [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	$ 477
Depreciation [Member] \| Risk Depreciation Price [Member] \| Sensitivity Scenario I [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	(1,125)
Depreciation [Member] \| Risk Depreciation Price [Member] \| Sensitivity Scenario Ii [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	(2,728)
Interest Rate [Member] \| Interest Rate Inside Brazil Decrease [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	477
Interest Rate [Member] \| Interest Rate Inside Brazil Decrease [Member] \| Sensitivity Scenario I [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	316
Interest Rate [Member] \| Interest Rate Inside Brazil Decrease [Member] \| Sensitivity Scenario Ii [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	130
Interest Rate [Member] \| Brazilian Interest Rate Increase [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	477
Interest Rate [Member] \| Brazilian Interest Rate Increase [Member] \| Sensitivity Scenario I [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	89
Interest Rate [Member] \| Brazilian Interest Rate Increase [Member] \| Sensitivity Scenario Ii [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	(227)
TJLP Interest Rate [Member] \| TJLP Interest Rate Increase [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	477
TJLP Interest Rate [Member] \| TJLP Interest Rate Increase [Member] \| Sensitivity Scenario I [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	475
TJLP Interest Rate [Member] \| TJLP Interest Rate Increase [Member] \| Sensitivity Scenario Ii [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	472
IPCA Index [Member] \| IPCA Index Decrease [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	477
IPCA Index [Member] \| IPCA Index Decrease [Member] \| Sensitivity Scenario I [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	236
IPCA Index [Member] \| IPCA Index Decrease [Member] \| Sensitivity Scenario Ii [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	26
SOFR Interest Rate [Member] \| SOFR Interest Rate Decrease [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	477
SOFR Interest Rate [Member] \| SOFR Interest Rate Decrease [Member] \| Sensitivity Scenario I [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	442
SOFR Interest Rate [Member] \| SOFR Interest Rate Decrease [Member] \| Sensitivity Scenario Ii [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	405
US Treasury Rate [Member] \| US Treasury Rate Increase [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	477
US Treasury Rate [Member] \| US Treasury Rate Increase [Member] \| Sensitivity Scenario I [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	478
US Treasury Rate [Member] \| US Treasury Rate Increase [Member] \| Sensitivity Scenario Ii [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	$ 478

Financial and capital risk management (Details 5)
$ in Millions

Jun. 30, 2025

USD ($)

Depreciation [Member] | Risk Depreciation Price [Member]

IfrsStatementLineItems [Line Items]

Fair value of liabilities

$ 477

Depreciation [Member] | Risk Depreciation Price [Member] | Sensitivity Scenario I [Member]

IfrsStatementLineItems [Line Items]

Fair value of liabilities

(1,125)

Depreciation [Member] | Risk Depreciation Price [Member] | Sensitivity Scenario Ii [Member]