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Finance debt (Details 4) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
IfrsStatementLineItems [Line Items]    
Borrowings $ 25,791 $ 23,162
Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 855  
Not later than one year [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 1,069 $ 2,566
Not later than one year [member] | B R L [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 196  
Not later than one year [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Borrowings 16  
Not later than one year [member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Borrowings 2  
Not later than one year [member] | C N Y [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 2  
Average interest rate 3.10%  
Not later than one year [member] | Weighted average [member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.30%  
Not later than one year [member] | Weighted average [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 7.40% 7.00%
Not later than one year [member] | Weighted average [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Average interest rate 10.50%  
Not later than one year [member] | Weighted average [member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.10%  
Not later than one year [member] | Floating interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 622  
Not later than one year [member] | Floating interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 145  
Not later than one year [member] | Fixed interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 233  
Not later than one year [member] | Fixed interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 51  
Not later than one year [member] | Fixed interest rate [member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Borrowings 16  
Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 1,465  
Later than one year and not later than two years [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 1,990 $ 1,864
Later than one year and not later than two years [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 494  
Later than one year and not later than two years [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 9  
Later than one year and not later than two years [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Borrowings 17  
Later than one year and not later than two years [member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Borrowings 5  
Later than one year and not later than two years [member] | C N Y [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 5  
Average interest rate 3.10%  
Later than one year and not later than two years [member] | Weighted average [member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.50%  
Later than one year and not later than two years [member] | Weighted average [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 7.60% 7.40%
Later than one year and not later than two years [member] | Weighted average [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Average interest rate 10.60%  
Later than one year and not later than two years [member] | Weighted average [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Average interest rate 4.60%  
Later than one year and not later than two years [member] | Weighted average [member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.10%  
Later than one year and not later than two years [member] | Floating interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 1,121  
Later than one year and not later than two years [member] | Floating interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 128  
Later than one year and not later than two years [member] | Floating interest rate [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 9  
Later than one year and not later than two years [member] | Fixed interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 344  
Later than one year and not later than two years [member] | Fixed interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 366  
Later than one year and not later than two years [member] | Fixed interest rate [member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Borrowings 17  
Later than two years and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 2,146  
Average interest rate 6.00%  
Later than two years and not later than three years [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 2,285 $ 2,264
Later than two years and not later than three years [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 134  
Later than two years and not later than three years [member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Borrowings 5  
Later than two years and not later than three years [member] | C N Y [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 5  
Average interest rate 3.00%  
Later than two years and not later than three years [member] | Weighted average [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 7.10% 7.10%
Later than two years and not later than three years [member] | Weighted average [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Average interest rate 9.70%  
Later than two years and not later than three years [member] | Floating interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 1,468  
Later than two years and not later than three years [member] | Floating interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 31  
Later than two years and not later than three years [member] | Fixed interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 678  
Later than two years and not later than three years [member] | Fixed interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 103  
Later than three years and not later than four years [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 1,555  
Later than three years and not later than four years [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 1,842 $ 1,791
Later than three years and not later than four years [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 137  
Later than three years and not later than four years [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 145  
Later than three years and not later than four years [member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Borrowings 5  
Later than three years and not later than four years [member] | C N Y [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 5  
Average interest rate 3.00%  
Later than three years and not later than four years [member] | Weighted average [member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 5.70%  
Later than three years and not later than four years [member] | Weighted average [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 7.10% 6.90%
Later than three years and not later than four years [member] | Weighted average [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Average interest rate 9.90%  
Later than three years and not later than four years [member] | Weighted average [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Average interest rate 4.60%  
Later than three years and not later than four years [member] | Floating interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 524  
Later than three years and not later than four years [member] | Floating interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 31  
Later than three years and not later than four years [member] | Floating interest rate [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 145  
Later than three years and not later than four years [member] | Fixed interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 1,031  
Later than three years and not later than four years [member] | Fixed interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 106  
Later than four years and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 720  
Later than four years and not later than five years [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 2,109 $ 1,780
Later than four years and not later than five years [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 955  
Later than four years and not later than five years [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 26  
Later than four years and not later than five years [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Borrowings 403  
Later than four years and not later than five years [member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Borrowings 5  
Later than four years and not later than five years [member] | C N Y [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 5  
Average interest rate 2.90%  
Later than four years and not later than five years [member] | Weighted average [member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.20%  
Later than four years and not later than five years [member] | Weighted average [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 7.70% 7.30%
Later than four years and not later than five years [member] | Weighted average [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Average interest rate 10.30%  
Later than four years and not later than five years [member] | Weighted average [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Average interest rate 4.70%  
Later than four years and not later than five years [member] | Weighted average [member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.10%  
Later than four years and not later than five years [member] | Floating interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 144  
Later than four years and not later than five years [member] | Floating interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 31  
Later than four years and not later than five years [member] | Floating interest rate [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 26  
Later than four years and not later than five years [member] | Fixed interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 576  
Later than four years and not later than five years [member] | Fixed interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 924  
Later than four years and not later than five years [member] | Fixed interest rate [member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Borrowings 403  
Later than five years [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 9,004  
Later than five years [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 16,496 $ 12,897
Later than five years [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 6,037  
Later than five years [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 424  
Later than five years [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Borrowings 566  
Later than five years [member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Borrowings 465  
Later than five years [member] | C N Y [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 465  
Average interest rate 3.10%  
Later than five years [member] | Weighted average [member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.60%  
Later than five years [member] | Weighted average [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.80% 6.60%
Later than five years [member] | Weighted average [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Average interest rate 8.30%  
Later than five years [member] | Weighted average [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Average interest rate 4.70%  
Later than five years [member] | Weighted average [member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.60%  
Later than five years [member] | Floating interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 921  
Later than five years [member] | Floating interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 5,496  
Later than five years [member] | Floating interest rate [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 424  
Later than five years [member] | Fixed interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 8,083  
Later than five years [member] | Fixed interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 541  
Later than five years [member] | Fixed interest rate [member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Borrowings 566  
Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 15,745  
Total [Member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 25,791 $ 23,162
Total [Member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 7,953  
Total [Member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 604  
Total [Member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Borrowings 1,002  
Total [Member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Borrowings $ 487  
Total [Member] | Weighted average [member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.50%  
Total [Member] | Weighted average [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.80% 6.80%
Total [Member] | Weighted average [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Average interest rate 9.40%  
Total [Member] | Weighted average [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Average interest rate 4.60%  
Total [Member] | Weighted average [member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.30%  
Total [Member] | Weighted average [member] | C N Y [Member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 0.00%  
Total [Member] | Floating interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 4,800  
Total [Member] | Floating interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 5,862  
Total [Member] | Floating interest rate [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 604  
Total [Member] | Floating interest rate [member] | C N Y [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 487  
Total [Member] | Fixed interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 10,945  
Total [Member] | Fixed interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 2,091  
Total [Member] | Fixed interest rate [member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Borrowings 1,002  
At fair value [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 15,567  
At fair value [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 25,035 $ 22,213
At fair value [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 7,401  
At fair value [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 609  
At fair value [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Borrowings 986  
At fair value [member] | China, Yuan Renminbi    
IfrsStatementLineItems [Line Items]    
Borrowings $ 472