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Impairment and onerous contracts - Ferrous Minerals (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2021
Impairment and onerous contracts
Goodwill.	$ 3,208
Impairment and disposal of non-current assets	426	$ 1,308	$ 3,383
Simoes Filho plant
Impairment and onerous contracts
Impairment and disposal of non-current assets		$ 76
Ferrous minerals
Impairment and onerous contracts
Consideration transferred				$ 40
Ferrous minerals | Simoes Filho plant
Impairment and onerous contracts
Impairment and disposal of non-current assets	$ 10

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The amount, at acquisition date, of contingent consideration arrangements recognised as consideration transferred in a business combination. [Refer: Business combinations [member]]

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The amount of impairment loss or reversal of impairment loss recognised in profit or loss. [Refer: Impairment loss recognised in profit or loss; Reversal of impairment loss recognised in profit or loss]

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