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Investments Accounted for Using the Equity Method - Summary of Financial Information of Significant Equity Accounted Investments (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of significant investments in associates and joint ventures [line items] |  |  |
Carrying amount of investments accounted for using the equity method | $ 1,742 | $ 2,585 | $ 2,569
Impairment of the carrying value of the investment | (2,635) | (494) | (264)
Fair value change on forward exchange derivatives | (145) | (422) | (8)
Profit/(loss) from equity accounted investments, related impairments and expenses | (921) | (512) | (546)
Dividends received from equity accounted investments | 737 |  |
Compania Minera Antamina S.A. [member] |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |
Current assets | 1,499 | 974 |
Non-current assets | 4,885 | 4,743 |
Current liabilities | (1,285) | (239) |
Non-current liabilities | (1,062) | (1,173) |
Net assets/(liabilities) - 100% | 4,037 | 4,305 |
Net assets/(liabilities) - Group share | 1,362 | 1,453 |
Carrying amount of investments accounted for using the equity method | 1,362 | 1,453 |
Revenue - 100% | 4,822 | 2,464 | 3,203
Profit/(loss) from Continuing operations - 100% | 1,847 | 629 | 1,168
Share of profit/(loss) of equity accounted investments | 623 | 212 | 394
Profit/(loss) from equity accounted investments, related impairments and expenses | 623 | 212 | 394
Comprehensive income/(loss) - 100% | 1,847 | 629 | 1,168
Share of comprehensive income/(loss) - Group share in equity accounted investments | 623 | 212 | 394
Dividends received from equity accounted investments | 714 | 105 | 361
Carbonesdel Cerrejon Limited Liability Corporation [Member] |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |
Current assets |  | 712 |
Non-current assets |  | 2,462 |
Current liabilities |  | (170) |
Non-current liabilities |  | (854) |
Net assets/(liabilities) - 100% |  | 2,150 |
Net assets/(liabilities) - Group share |  | 717 |
Adjustments to net assets related to accounting policy adjustments |  | 59 |
Carrying amount of investments accounted for using the equity method |  | 776 |
Revenue - 100% | 844 | 1,091 | 2,094
Profit/(loss) from Continuing operations - 100% | (43) | (182) | 309
Share of profit/(loss) of equity accounted investments | (14) | (68) | 103
Impairment of the carrying value of the investment | (466) |  |
Profit/(loss) from equity accounted investments, related impairments and expenses | (480) | (68) | 103
Comprehensive income/(loss) - 100% | (43) | (182) | 309
Share of comprehensive income/(loss) - Group share in equity accounted investments | (480) | (68) | 103
Dividends received from equity accounted investments | 13 | 9 | 134
Individually immaterial, associates [member] |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |
Carrying amount of investments accounted for using the equity method | 380 | 356 |
Profit/(loss) from equity accounted investments, related impairments and expenses | (74) | (148) | (98)
Share of comprehensive income/(loss) - Group share in equity accounted investments | (74) | (148) | (98)
Dividends received from equity accounted investments | 10 | 12 | 15
Samarco Mineracao S.A. [member] |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |
Current assets | 509 | 49 |
Non-current assets | 4,380 | 3,601 |
Current liabilities | (9,222) | (7,961) |
Non-current liabilities | (7,627) | (5,447) |
Net assets/(liabilities) - 100% | (11,960) | (9,758) |
Net assets/(liabilities) - Group share | (5,980) | (4,879) |
Adjustments to net assets related to accounting policy adjustments | 280 | 256 |
Investment in Samarco | 516 | 405 |
Impairment of the carrying value of the investment in Samarco | (1,041) | (930) |
Additional share of Samarco losses | 4,442 | 3,341 |
Unrecognised losses | 1,783 | 1,807 |
Revenue - 100% | 814 | 26 | 24
Profit/(loss) from Continuing operations - 100% | (2,202) | (3,617) | (2,166)
Share of profit/(loss) of equity accounted investments | (1,076) | (1,918) | (1,075)
Impairment of the carrying value of the investment | (111) | (95) | (96)
Additional share of Samarco losses | 85 | 93 | 108
Fair value change on forward exchange derivatives | 136 |  |
Unrecognised losses | (24) | 1,412 | 118
Profit/(loss) from equity accounted investments, related impairments and expenses | (990) | (508) | (945)
Comprehensive income/(loss) - 100% | (2,202) | (3,617) | (2,166)
Share of comprehensive income/(loss) - Group share in equity accounted investments | (990) | (508) | (945)
Investments accounted for using equity method [member] |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |
Carrying amount of investments accounted for using the equity method | 1,742 | 2,585 |
Profit/(loss) from equity accounted investments, related impairments and expenses | (921) | (512) | (546)
Share of comprehensive income/(loss) - Group share in equity accounted investments | (921) | (512) | (546)
Dividends received from equity accounted investments | $ 737 | $ 126 | $ 510

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