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Impairment reversal (impairment and disposals) of non-current assets (Details 1)
t in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
t
Dec. 31, 2021
USD ($)
t
Iron Ore Pellets [Member]    
IfrsStatementLineItems [Line Items]    
Impairment testing results The recoverable amount of the operating segments is higher than the carrying amount and, therefore, there is no impairment to be recognized.  
Nickel Operations [Member]    
IfrsStatementLineItems [Line Items]    
Impairment testing results The recoverable amount of the operating segments is higher than the carrying amount and, therefore, there is no impairment to be recognized.  
Research And Development Project [Member]    
IfrsStatementLineItems [Line Items]    
Impairment testing results The recoverable amount of the operating segments is higher than the carrying amount and, therefore, there is no impairment to be recognised.  
Iron Ore Pellets [Member]    
IfrsStatementLineItems [Line Items]    
Carrying amount | $ $ 1,367 $ 1,278
Impairment testing results   The recoverable amount of the operating segments is higher than the carrying amount and, therefore, there is no impairment to be recognized.
Measurement of recoverable value FVLCD FVLCD
Discount rate 6.40% 4.40%
Period of cash flow projections 2052 2051
Sensitivity of key assumptions A 29% reduction in the long-term prices of all commodities or a 51% reduction in reserves would, alone, result in estimated recoverable amount equal to the carrying value of this CGU. A 29% reduction in the long-term prices of all commodities or a 52% reduction in reserves would, alone, result in estimated recoverable amount equal to the carrying value of this CGU.
Iron Ore Pellets [Member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Range iron ore forecasted prices 75 80
Iron Ore Pellets [Member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Range iron ore forecasted prices 95 90
Nickel Operations [Member]    
IfrsStatementLineItems [Line Items]    
Carrying amount | $ $ 1,822 $ 1,930
Impairment testing results   The recoverable amount of the operating segments is higher than the carrying amount and, therefore, there is no impairment to be recognized.
Measurement of recoverable value FVLCD FVLCD
Period of cash flow projections 2045 2045
Sensitivity of key assumptions A 23.7% reduction in the long-term prices of all commodities or an 8.4% reduction in volumes would, alone, result in estimated recoverable amount equal to the carrying value of this CGU. A 27.9% reduction in the long-term prices of all commodities or an 10.1% reduction in volumes would, alone, result in estimated recoverable amount equal to the carrying value of this CGU.
Nickel Operations [Member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Discount rate 4.50% 3.20%
Range iron ore forecasted prices 21,000 17,000
Nickel Operations [Member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Discount rate 5.30% 3.80%
Range iron ore forecasted prices 24,000 19,000
Research And Development Project [Member]    
IfrsStatementLineItems [Line Items]    
Carrying amount | $ $ 528 $ 494
Impairment testing results   The recoverable amount of the operating segments is higher than the carrying amount and, therefore, there is no impairment to be recognised.
Measurement of recoverable value FVLCD FVLCD
Discount rate 6.40% 4.40%
Period of cash flow projections   2051
Sensitivity of key assumptions A 77% reduction in in processing and beneficiating iron ore volumes would, alone, result in estimated recoverable amount equal to the carrying value of this CGU. A 80% reduction in processing and beneficiating iron ore volumes would, alone, result in estimated recoverable amount equal to the carrying value of this CGU.