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Information by business segment and by geographic area - Provisionally priced commodities sales (Details) t in Thousands, $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($) t $ / t
Iron ore
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]
Thousand metric tons | t	18,155
Provisional price | $ / t	181.3
Change +-	10.00%
Effect on Revenue | $	$ 329
Copper
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]
Thousand metric tons | t	65
Provisional price | $ / t	11,627.7
Change +-	10.00%
Effect on Revenue | $	$ 76

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- Definition

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+ References

No definition available.

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- Definition

The amount of increase (decrease) in the fair value measurement of assets, recognised in profit or loss after tax, due to a reasonably possible decrease in an unobservable input. [Refer: Tax income (expense)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2020-01-01
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- Definition

The percentage of a reasonably possible increase in an unobservable input used in fair value measurement of assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 13
-IssueDate 2020-01-01
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- Definition

Provisional price of products under risk on final settlement of provisionally priced accounts receivables.

+ References

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- Definition

The mass of products under risk on final settlement of provisionally priced accounts receivables.

+ References

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