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Finance debt (Details 4) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Borrowings $ 29,954 $ 35,700
Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 2,879  
Not later than one year [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 3,576 $ 3,641
Not later than one year [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 622  
Not later than one year [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 37  
Not later than one year [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Borrowings $ 38  
Not later than one year [member] | Weighted average [member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.80%  
Not later than one year [member] | Weighted average [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.70% 5.20%
Not later than one year [member] | Weighted average [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.70%  
Not later than one year [member] | Weighted average [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Average interest rate 4.70%  
Not later than one year [member] | Weighted average [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.20%  
Not later than one year [member] | Later than two years and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.10%  
Not later than one year [member] | Floating interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 2,588  
Not later than one year [member] | Floating interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 324  
Not later than one year [member] | Floating interest rate [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 37  
Not later than one year [member] | Floating interest rate [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Borrowings 38  
Not later than one year [member] | Fixed interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 291  
Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 3,240  
Later than one year and not later than two years [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 3,943 $ 2,973
Later than one year and not later than two years [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 690  
Later than one year and not later than two years [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings $ 13  
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 6.50% 5.30%
Later than one year and not later than two years [member] | Weighted average [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.90%  
Later than one year and not later than two years [member] | Weighted average [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Average interest rate 4.70%  
Later than one year and not later than two years [member] | Weighted average [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Average interest rate 0.00%  
Later than one year and not later than two years [member] | Floating interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 2,681  
Later than one year and not later than two years [member] | Floating interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 280  
Later than one year and not later than two years [member] | Floating interest rate [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 13  
Later than one year and not later than two years [member] | Fixed interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 559  
Later than one year and not later than two years [member] | Fixed interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 410  
Later than two years and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 2,569  
Later than two years and not later than three years [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 3,079 $ 3,988
Later than two years and not later than three years [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 221  
Later than two years and not later than three years [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings $ 289  
Later than two years and not later than three years [member] | Weighted average [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.10% 5.50%
Later than two years and not later than three years [member] | Weighted average [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.50%  
Later than two years and not later than three years [member] | Weighted average [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Average interest rate 4.70%  
Later than two years and not later than three years [member] | Weighted average [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Average interest rate 0.00%  
Later than two years and not later than three years [member] | Floating interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 1,934  
Later than two years and not later than three years [member] | Floating interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 138  
Later than two years and not later than three years [member] | Floating interest rate [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 289  
Later than two years and not later than three years [member] | Fixed interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 635  
Later than two years and not later than three years [member] | Fixed interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 83  
Later than three years and not later than four years [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 1,528  
Later than three years and not later than four years [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 2,523 $ 3,449
Later than three years and not later than four years [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 440  
Later than three years and not later than four years [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Borrowings $ 555  
Later than three years and not later than four years [member] | Weighted average [member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.30%  
Later than three years and not later than four years [member] | Weighted average [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.20% 5.60%
Later than three years and not later than four years [member] | Weighted average [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.20%  
Later than three years and not later than four years [member] | Weighted average [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.20%  
Later than three years and not later than four years [member] | Floating interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 1,143  
Later than three years and not later than four years [member] | Floating interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 138  
Later than three years and not later than four years [member] | Floating interest rate [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Borrowings 555  
Later than three years and not later than four years [member] | Fixed interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 385  
Later than three years and not later than four years [member] | Fixed interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 302  
Later than four years and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 2,465  
Later than four years and not later than five years [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 2,892 $ 2,832
Later than four years and not later than five years [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings $ 427  
Later than four years and not later than five years [member] | Weighted average [member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 5.90%  
Later than four years and not later than five years [member] | Weighted average [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.00% 5.90%
Later than four years and not later than five years [member] | Weighted average [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.40%  
Later than four years and not later than five years [member] | Weighted average [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Average interest rate 0.00%  
Later than four years and not later than five years [member] | Floating interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 1,739  
Later than four years and not later than five years [member] | Floating interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 333  
Later than four years and not later than five years [member] | Fixed interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 726  
Later than four years and not later than five years [member] | Fixed interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 94  
Later than five years [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 10,006  
Later than five years [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 13,941 $ 18,817
Later than five years [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 2,507  
Later than five years [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 583  
Later than five years [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Borrowings $ 845  
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 6.60% 6.50%
Later than five years [member] | Weighted average [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.60%  
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] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.50%  
Later than five years [member] | Floating interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings $ 652  
Later than five years [member] | Floating interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 1,060  
Later than five years [member] | Floating interest rate [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 583  
Later than five years [member] | Floating interest rate [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Borrowings 845  
Later than five years [member] | Fixed interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 9,354  
Later than five years [member] | Fixed interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 1,447  
Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 22,687  
Total [Member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 29,954 $ 35,700
Total [Member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 4,907  
Total [Member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 922  
Total [Member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Borrowings $ 1,438  
Total [Member] | Weighted average [member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.60%  
Total [Member] | Weighted average [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.50% 6.20%
Total [Member] | Weighted average [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.60%  
Total [Member] | Weighted average [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Average interest rate 4.70%  
Total [Member] | Weighted average [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Average interest rate 6.30%  
Total [Member] | Floating interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings $ 2,273  
Total [Member] | Floating interest rate [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 922  
Total [Member] | Floating interest rate [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Borrowings 1,438  
Total [Member] | Fixed interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 11,950  
Total [Member] | Fixed interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 2,634  
At fair value [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 22,721  
At fair value [member] | Finance Debt Total [Member]    
IfrsStatementLineItems [Line Items]    
Borrowings 29,853 $ 37,891
At fair value [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings 4,907  
At fair value [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Borrowings 897  
At fair value [member] | United Kingdom, Pounds    
IfrsStatementLineItems [Line Items]    
Borrowings 1,328  
Up To One Year [Member] | Floating interest rate [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 10,737  
Up To One Year [Member] | Fixed interest rate [member] | Brazil, Brazil Real    
IfrsStatementLineItems [Line Items]    
Borrowings $ 298