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Significant Events - Summary of Financial Impacts of Samarco Dam Failure (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Expenses excluding net finance costs: |  |  |
Costs incurred directly by BHP Billiton Brasil and other BHP entities in relation to the Samarco dam failure | $ (28,036) | $ (24,515) | $ (24,091)
Loss from equity accounted investments, related impairments and expenses: |  |  |
Loss from operations | 566 | 636 | 2,520
Net finance costs | (1,245) | (1,417) | (1,013)
Loss before taxation | (650) | (763) | (2,520)
Income tax benefit | (2,320) | (243) | (247)
Loss after taxation | (2,970) | (1,006) | (2,767)
Balance sheet movement |  |  |
Movement in Trade and other payables | (719) | (512) | 1,272
Cash flow statement |  |  |
Loss before taxation | (650) | (763) | (2,520)
Net finance costs | 1,245 | 1,417 | 1,013
Changes in assets and liabilities |  |  |
Trade and other payables | 719 | 512 | (1,272)
Net operating cash flows | 18,461 | 16,804 | 10,625
Net investing cash flows | (5,921) | (4,161) | (7,245)
Net decrease in cash and cash equivalents | 1,650 | 3,047 | 4,138
Samarco dam failure [member] |  |  |
Expenses excluding net finance costs: |  |  |
Costs incurred directly by BHP Billiton Brasil and other BHP entities in relation to the Samarco dam failure | (57) | (82) | (70)
Loss from equity accounted investments, related impairments and expenses: |  |  |
Share of loss relating to the Samarco dam failure | (80) | (134) | (655)
Impairment of the carrying value of the investment in Samarco |  |  | (525)
Samarco dam failure provision | (429) | (38) | (1,200)
Loss from operations | (566) | (254) | (2,450)
Net finance costs | (84) | (127) |
Loss before taxation | (650) | (381) | (2,450)
Income tax benefit |  |  | 253
Loss after taxation | (650) | (381) | (2,197)
Balance sheet movement |  |  |
Movement in Trade and other payables | 4 | (3) | (11)
Movement in Investments accounted for using the equity method |  |  | (1,180)
Movement in Deferred tax assets |  |  | (158)
Movement in Provisions | (228) | 143 | (1,200)
Movement in Deferred tax liabilities |  |  | 411
Net (liabilities)/assets | (224) | 140 | (2,138)
Cash flow statement |  |  |
Loss before taxation | (650) | (381) | (2,450)
Share of loss relating to the Samarco dam failure | 80 | 134 | 655
Impairment of the carrying value of the investment in Samarco |  |  | (525)
Samarco dam failure provision | 429 | 38 | 1,200
Net finance costs | 84 | 127 |
Changes in assets and liabilities |  |  |
Trade and other payables | (4) | 3 | 11
Net operating cash flows | (61) | (79) | (59)
Net investment and funding of equity accounted investments | (365) | (442) |
Net investing cash flows | (365) | (442) |
Net decrease in cash and cash equivalents | $ (426) | $ (521) | $ (59)

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