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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, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Disclosure of significant investments in associates and joint ventures [Line Items] |  |  |
Carrying amount of investments accounted for using the equity method | $ 2,473 | $ 2,448 | $ 2,575
Profit/(loss) from equity accounted investments, related impairments and expenses | 147 | 272 | (2,104)
Dividends received from equity accounted investments | 693 |  |
Compania Minera Antamina S.A. [member] |  |  |
Disclosure of significant investments in associates and joint ventures [Line Items] |  |  |
Current assets | 1,099 | 995 |
Non-current assets | 4,385 | 4,273 |
Current liabilities | (532) | (530) |
Non-current liabilities | (1,064) | (993) |
Net assets/(liabilities) - 100% | 3,888 | 3,745 |
Net assets/(liabilities) - Group share | 1,312 | 1,264 |
Adjustments to net assets related to accounting policy adjustments | 1 | 1 |
Carrying amount of investments accounted for using the equity method | 1,313 | 1,265 |
Revenue - 100% | 4,262 | 3,317 | 2,639
Profit/(loss) from Continuing operations - 100% | 1,613 | 1,010 | 606
Share of operating profit/(loss) of equity accounted investments | 544 | 341 | 203
Profit/(loss) from equity accounted investments, related impairments and expenses | 544 | 341 | 203
Comprehensive income - 100% | 1,613 | 1,010 | 606
Share of comprehensive income/(loss) - Group share in equity accounted investments | 544 | 341 | 203
Dividends received from equity accounted investments | 496 | 425 | 233
Carbones del Cerrejon LLC [member] |  |  |
Disclosure of significant investments in associates and joint ventures [Line Items] |  |  |
Current assets | 1,187 | 782 |
Non-current assets | 2,485 | 2,540 |
Current liabilities | (585) | (364) |
Non-current liabilities | (663) | (621) |
Net assets/(liabilities) - 100% | 2,424 | 2,337 |
Net assets/(liabilities) - Group share | 808 | 779 |
Adjustments to net assets related to accounting policy adjustments | 75 | 80 |
Carrying amount of investments accounted for using the equity method | 883 | 859 |
Revenue - 100% | 2,453 | 2,247 | 1,575
Profit/(loss) from Continuing operations - 100% | 576 | 388 | (73)
Share of operating profit/(loss) of equity accounted investments | 192 | 129 | (24)
Profit/(loss) from equity accounted investments, related impairments and expenses | 192 | 129 | (24)
Comprehensive income - 100% | 576 | 388 | (73)
Share of comprehensive income/(loss) - Group share in equity accounted investments | 192 | 129 | (24)
Dividends received from equity accounted investments | 181 | 163 | 29
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 | 277 | 324 |
Share of operating profit/(loss) of equity accounted investments |  |  | (39)
Profit/(loss) from equity accounted investments, related impairments and expenses | (80) | (26) | (39)
Share of comprehensive income/(loss) - Group share in equity accounted investments | (80) | (26) | (39)
Dividends received from equity accounted investments | 16 | 32 | 31
Samarco Mineracao S.A. [member] |  |  |
Disclosure of significant investments in associates and joint ventures [Line Items] |  |  |
Current assets | 79 | 174 |
Non-current assets | 6,023 | 6,128 |
Current liabilities | (5,811) | (5,236) |
Non-current liabilities | (4,265) | (3,482) |
Net assets/(liabilities) - 100% | (3,974) | (2,416) |
Net assets/(liabilities) - Group share | (1,987) | (1,208) |
Adjustments to net assets related to accounting policy adjustments | 357 | 401 |
Impairment of the carrying value of the investment in Samarco | (525) | (525) |
Additional share of Samarco losses | 2,092 | 1,332 |
Unrecognised losses | 63 |  |
Revenue - 100% | 30 | 28 | 937
Profit/(loss) from Continuing operations - 100% | (1,558) | (1,520) | (2,182)
Share of operating profit/(loss) of equity accounted investments | (823) | (760) | (1,091)
Additional share of Samarco losses | 251 | 588 |
Unrecognised losses | 63 |  |
Profit/(loss) from equity accounted investments, related impairments and expenses | (509) | (172) | (2,244)
Comprehensive income - 100% | (1,558) | (1,520) | (2,182)
Share of comprehensive income/(loss) - Group share in equity accounted investments | (509) | (172) | (2,244)
Samarco dam failure provision expense |  |  | (628)
Impairment of the carrying value of the investment in Samarco |  |  | (525)
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 | 2,473 | 2,448 |
Share of operating profit/(loss) of equity accounted investments |  |  | (951)
Profit/(loss) from equity accounted investments, related impairments and expenses | 147 | 272 | (2,104)
Share of comprehensive income/(loss) - Group share in equity accounted investments | 147 | 272 | (2,104)
Dividends received from equity accounted investments | $ 693 | $ 620 | 293
Samarco dam failure provision expense |  |  | (628)
Impairment of the carrying value of the investment in Samarco |  |  | $ (525)

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