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Assets and liabilities held for sale - Additional information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Rossing Uranium [member] | Mining properties [member] |  |
Disclosure Of Assets And Liabilities Held For Sale Line Item |  |
Expected loss on asset held for sale | $ 300 |
Assets and liabilities classified as held for sale [member] | Rossing Uranium [member] |  |
Disclosure Of Assets And Liabilities Held For Sale Line Item |  |
Ownership interest in subsidiary | 106 |
Assets and liabilities classified as held for sale [member] | ISAL Smelter [member] |  |
Disclosure Of Assets And Liabilities Held For Sale Line Item |  |
Ownership interest in subsidiary | $ 334 |
Assets and liabilities classified as held for sale [member] | Dunkerque Aluminium Smelter [Member] |  |
Disclosure Of Assets And Liabilities Held For Sale Line Item |  |
Ownership interest in subsidiary |  | $ 355

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- Details
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