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Impairment and onerous contracts - Ferrous Minerals (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Impairment and onerous contracts
Discount rate on cash flows	5.93%
Impairment and disposal of non-current assets	$ 2,243	$ 5,074	$ 899
Simoes Filho plant
Impairment and onerous contracts
Impairment and disposal of non-current assets	76
Carrying amount for CGU	$ 75
Ferrous minerals
Impairment and onerous contracts
Discount rate on cash flows	5.60%	6.30%
Goodwill	$ 1,373

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The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [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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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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