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Financial and capital risk management - Freight derivative positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative financial instruments.
Financial settlement inflows (outflows)	$ (34)	$ (324)	$ (67)

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- Definition

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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No definition available.

+ Details

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- Definition

The amount of cash inflow (outflow) from settlement of derivatives.

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No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration