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Acquisitions and divestitures - Business combinations - NLC (Details) - Nacala Logistics Corridor - USD ($) $ in Millions		1 Months Ended	6 Months Ended	12 Months Ended
	Jun. 22, 2021	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Disclosure of detailed information about business combination [line items]
Settlement of loans with third parties	$ 2,517	$ 2,517	$ 2,517
Percentage of voting capital acquired	50.00%
Loss on pre-existing relationship	$ (771)	$ (771)	$ (771)	$ (798)
Discount rate		11.60%	11.60%

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- Definition

The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]]

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- Definition

The discount rate used in the current estimate of the present value of the future cash flows expected to be derived from an asset or cash-generating unit.

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- Definition

The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]]

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