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Investments Accounted for Using the Equity Method - Summary of Financial Information of Significant Equity Accounted Investments (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Cash and cash equivalents | $ 15,613 | $ 15,871 | $ 14,153 |
Investment | 2,569 | 2,473 | 2,448 |
Net finance costs | (1,064) | (1,245) | (1,417) |
Depreciation and amortisation | 5,829 | 6,288 | 6,184 |
Interest income | 446 | 322 | 143 |
Interest expense | 1,510 | 1,567 | 1,560 |
Income tax benefit/(expense) | (5,529) | (7,007) | (4,443) |
Samarco Mineracao S.A. [member] |  |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Cash and cash equivalents | 246 | 23 |  |
Current financial liabilities (excluding trade and other payables and provisions) | 5,510 | 5,066 |  |
Investment |  |  |  |
Share of loss |  |  |  | (655)
Impairment |  |  |  | $ (525)
Additional share of loss | (3,145) |  |  |
Loss from funding provided to Samarco | (310) |  |  |
Net finance costs | (319) |  |  |
Depreciation and amortisation | 85 | 73 | 88 |
Interest income | 22 | 31 | 57 |
Interest expense | 342 | 385 | 473 |
Income tax benefit/(expense) | 52 | (154) | $ (851) |
Samarco Mineracao S.A. [member] | Samarco dam failure [member] |  |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Other movements | (2,835) |  |  |
Individually immaterial, associates [member] |  |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Unrecognised share of profits (losses) | 15 | (56) |  |
Cumulative losses | 181 | 196 |  |
Investment | $ 371 | $ 277 |  |

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