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Exceptional Items - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019
Disclosure of exceptional items [line items] |  |  |  |
Exceptional gain (loss), before tax | $ 784 |  | $ 210 | $ 1,060
Samarco dam failure [member] |  |  |  |
Disclosure of exceptional items [line items] |  |  |  |
Exceptional gain (loss), before tax | $ 6 | [1] | $ 210 | $ 1,060
[1] | Refer to note 9 Significant events – Samarco dam failure for further information.

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