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Acquisitions and divestitures - Ningbo Zhoushan Port (Details) - Ningbo Zhoushan Port $ in Millions	1 Months Ended
	Oct. 31, 2020 USD ($)
Disclosure of joint ventures [line items]
Ownership interest in joint venture (as a percent)	50.00%
Term of joint venture	3 years
Minimum
Disclosure of joint ventures [line items]
Capital contribution	$ 110
Maximum
Disclosure of joint ventures [line items]
Capital contribution	$ 160

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- Definition

The amount of investments in joint ventures in an entity's separate financial statements. [Refer: Joint ventures [member]]

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The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Joint ventures [member]]

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Represents the term of joint venture.

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