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Information by business segment and by geographic area - Provisionally priced commodities sales (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) kt $ / t
Iron ore
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]
Change	(10.00%)
Iron ore | Accounts receivable
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]
Thousand metric tons | kt	27,169
Provisional price | $ / t	150.6
Change	(10.00%)
Effect on Revenue | $	$ 409
Iron ore Pellets
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]
Change	(10.00%)
Iron ore Pellets | Accounts receivable
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]
Thousand metric tons | kt	418
Provisional price | $ / t	181.9
Change	(10.00%)
Effect on Revenue | $	$ 8
Copper
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]
Change	(10.00%)
Copper | Accounts receivable
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]
Thousand metric tons | kt	89
Provisional price | $ / t	9,723.4
Change	(10.00%)
Effect on Revenue | $	$ 86

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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)]

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

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

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