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Acquisitions and divestitures - PT Vale Indonesia Tbk (Details) - USD ($) $ in Millions	1 Months Ended			12 Months Ended
	Dec. 31, 2020	Oct. 31, 2020	Jun. 30, 2020	Dec. 31, 2020
Disclosure of detailed information about business combination [line items]
Divestment of shares to Indonesian participants ( as a percentage )	8.00%
PTVI
Disclosure of detailed information about business combination [line items]
Ownership interest sold in subsidiary (as a percent)		44.30%	20.00%
Divestment of shares to Indonesian participants ( as a percentage )			14.90%
Cash consideration from divestment of shares in subsidiary		$ 278
Loss from divestiture of shares in subsidiary				$ 179
Collective ownership Interest held by the company and SMM, after the divestment (as a percentage)		59.30%
Sumitomo Metal Mining Co., Ltd
Disclosure of detailed information about business combination [line items]
Ownership interest sold in subsidiary (as a percent)		15.00%
Divestment of shares to Indonesian participants ( as a percentage )			5.10%

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

The amount cash consideration from divestment of shares in subsidiary.

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- Definition

Represents the amount of gain (loss) recognized from divestment of shares in subsidiary.

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The percentage of shares that are to be divested.

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- Definition

The proportion of ownership interest in a subsidiary held by the entity and the party to a divestment of shares in such subsidiary, after the divestment transaction.

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The proportion of ownership interest sold in a subsidiary attributable to the entity

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