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Acquisitions and divestitures - Ningbo Zhoushan Port (Details) - Ningbo Zhoushan Port $ in Millions | 1 Months Ended
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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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