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Significant Events - Summary of Financial Impacts of Samarco Dam Failure (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Income statement |  |  |
Other income | $ 393 | $ 247 | $ 662
Expenses excluding net finance costs: |  |  |
Costs incurred directly by BHP Billiton Brasil and other BHP entities in relation to the Samarco dam failure | (28,022) | (27,527) | (24,120)
Loss from equity accounted investments, related impairments and expenses: |  |  |
Loss from operations | (952) | (566) | (636)
Net finance costs | (1,064) | (1,245) | (1,417)
Loss before taxation | (1,060) | (650) | (763)
Income tax benefit | 242 | (2,320) | (243)
Loss after taxation | (818) | (2,970) | (1,006)
Balance sheet movement |  |  |
Trade and other payables | (406) | (719) | (512)
Cash flow statement |  |  |
Loss before taxation | (1,060) | (650) | (763)
Net finance costs | 1,064 | 1,245 | 1,417
Changes in assets and liabilities: |  |  |
Trade and other payables | 406 | 719 | 512
Net operating cash flows | 17,871 | 18,461 | 16,804
Net investing cash flows | 2,607 | (5,921) | (4,161)
Net decrease in cash and cash equivalents | (10,495) | 1,650 | 3,047
Samarco dam failure [member] |  |  |
Income statement |  |  |
Other income | 50 |  |
Expenses excluding net finance costs: |  |  |
Costs incurred directly by BHP Billiton Brasil and other BHP entities in relation to the Samarco dam failure | (57) | (57) | (82)
Loss from equity accounted investments, related impairments and expenses: |  |  |
Share of loss relating to the Samarco dam failure | (96) | (80) | (134)
Samarco Germano dam decommissioning | (263) |  |
Samarco dam failure provision | (586) | (429) | (38)
Loss from operations | (952) | (566) | (254)
Net finance costs | (108) | (84) | (127)
Loss before taxation | (1,060) | (650) | (381)
Income tax benefit | 0 | 0 | 0
Loss after taxation | (1,060) | (650) | (381)
Balance sheet movement |  |  |
Trade and other payables | 4 | 4 | (3)
Provisions | (629) | (228) | 143
Net (liabilities)/assets | (625) | (224) | 140
Cash flow statement |  |  |
Loss before taxation | (1,060) | (650) | (381)
Share of loss relating to the Samarco dam failure | 96 | 80 | 134
Samarco Germano dam decommissioning | 263 |  |
Samarco dam failure provision | 586 | 429 | 38
Net finance costs | 108 | 84 | 127
Changes in assets and liabilities: |  |  |
Trade and other payables | (4) | (4) | 3
Net operating cash flows | (11) | (61) | (79)
Net investment and funding of equity accounted investments | (424) | (365) | (442)
Net investing cash flows | (424) | (365) | (442)
Net decrease in cash and cash equivalents | $ (435) | $ (426) | $ (521)

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