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Loans, borrowings, leases, cash and cash equivalents and short-term investments - Annual minimum payments (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2023
USD ($)
IfrsStatementLineItems [Line Items]  
Annual minimum payments $ 1,949
Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 190
Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 217
Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 202
Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 150
Later Than Four Years [Member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 1,190
Ports [Member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments $ 929
Ports [Member] | Bottom of range [member]  
IfrsStatementLineItems [Line Items]  
Average Remaining Term 3 years
Discount rate 3.00%
Ports [Member] | Top of range [member]  
IfrsStatementLineItems [Line Items]  
Average Remaining Term 20 years
Discount rate 5.00%
Ports [Member] | Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments $ 49
Ports [Member] | Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 66
Ports [Member] | Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 65
Ports [Member] | Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 52
Ports [Member] | Later Than Four Years [Member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 697
Ships [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments $ 511
Ships [member] | Bottom of range [member]  
IfrsStatementLineItems [Line Items]  
Average Remaining Term 2 years
Discount rate 3.00%
Ships [member] | Top of range [member]  
IfrsStatementLineItems [Line Items]  
Average Remaining Term 10 years
Discount rate 4.00%
Ships [member] | Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments $ 46
Ships [member] | Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 60
Ships [member] | Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 59
Ships [member] | Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 54
Ships [member] | Later Than Four Years [Member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 292
Pellets Plants [Member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments $ 288
Pellets Plants [Member] | Bottom of range [member]  
IfrsStatementLineItems [Line Items]  
Average Remaining Term 1 year
Discount rate 2.00%
Pellets Plants [Member] | Top of range [member]  
IfrsStatementLineItems [Line Items]  
Average Remaining Term 10 years
Discount rate 5.00%
Pellets Plants [Member] | Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments $ 59
Pellets Plants [Member] | Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 50
Pellets Plants [Member] | Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 47
Pellets Plants [Member] | Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 17
Pellets Plants [Member] | Later Than Four Years [Member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 115
Properties [Member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments $ 125
Properties [Member] | Bottom of range [member]  
IfrsStatementLineItems [Line Items]  
Average Remaining Term 1 year
Discount rate 1.00%
Properties [Member] | Top of range [member]  
IfrsStatementLineItems [Line Items]  
Average Remaining Term 10 years
Discount rate 6.00%
Properties [Member] | Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments $ 25
Properties [Member] | Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 28
Properties [Member] | Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 18
Properties [Member] | Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 16
Properties [Member] | Later Than Four Years [Member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 38
Energy Plants [Member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments $ 71
Energy Plants [Member] | Bottom of range [member]  
IfrsStatementLineItems [Line Items]  
Average Remaining Term 1 year
Discount rate 5.00%
Energy Plants [Member] | Top of range [member]  
IfrsStatementLineItems [Line Items]  
Average Remaining Term 7 years
Discount rate 6.00%
Energy Plants [Member] | Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments $ 5
Energy Plants [Member] | Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 7
Energy Plants [Member] | Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 7
Energy Plants [Member] | Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 6
Energy Plants [Member] | Later Than Four Years [Member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 46
Mining Equipment [Member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments $ 25
Mining Equipment [Member] | Bottom of range [member]  
IfrsStatementLineItems [Line Items]  
Average Remaining Term 1 year
Discount rate 2.00%
Mining Equipment [Member] | Top of range [member]  
IfrsStatementLineItems [Line Items]  
Average Remaining Term 5 years
Discount rate 6.00%
Mining Equipment [Member] | Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments $ 6
Mining Equipment [Member] | Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 6
Mining Equipment [Member] | Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 6
Mining Equipment [Member] | Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments 5
Mining Equipment [Member] | Later Than Four Years [Member]  
IfrsStatementLineItems [Line Items]  
Annual minimum payments $ 2