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Assets and liabilities held for sale - Additional information (Detail) $ in Millions	Dec. 31, 2017 USD ($)
Assets and liabilities classified as held for sale [member] | Dunkerque Aluminium Smelter [Member]
Disclosure Of Financial Instruments [Line Items]
Ownership interest in subsidiary	$ 355

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- Definition

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- Definition

The ownership interest in a subsidiary attributable to the entity.

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No definition available.

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- Details

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