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Investments Accounted for Using the Equity Method - Summary of Movements of Investments Accounted for using the Equity Method (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Disclosure of significant investments in associates and joint ventures [line items]
Profit/(loss) from equity accounted investments, related impairments and expenses	$ (546)	$ 147	$ 272
Funding provided during the period	(303)
Joint ventures [member]
Disclosure of significant investments in associates and joint ventures [line items]
Profit/(loss) from equity accounted investments, related impairments and expenses	(945)
Funding provided during the period	(96)
Joint ventures [member] | Samarco dam failure [member]
Disclosure of significant investments in associates and joint ventures [line items]
Share of loss	(96)
Funding provided during the period	(96)
Other movements	(849)
Change in estimate	(579)
Exchange translation	(7)
Samarco Germano dam decommissioning	$ (263)

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Decommissioning costs.

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Disclosure of significant investments in associates and joint ventures.

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The entity's share of profit (loss) from associates and joint ventures accounted for using the equity method and related impairments and expenses.

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The amount of additional other provisions made. [Refer: Other provisions]

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The increase (decrease) in an accounting estimate that has an effect in the current period or is expected to have an effect in future periods.

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The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions]

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The cash outflow for the purchase of interests in investments accounted for using the equity method. [Refer: Investments accounted for using equity method]

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The entity's share of the profit (loss) of joint ventures accounted for using the equity method. [Refer: Investments accounted for using equity method; Joint ventures [member]; Profit (loss)]

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