Significant Events - Summary of Financial Impacts of Samarco Dam Failure (Detail) - USD ($)
$ in Millions |
12 Months Ended |
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2019 |
| Income statement |
|
|
|
| Other income |
$ 510
|
$ 777
|
$ 393
|
| Expenses excluding net finance costs: |
|
|
|
| Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure |
(34,500)
|
(28,775)
|
(28,022)
|
| Loss from equity accounted investments, related impairments and expenses: |
|
|
|
| Samarco impairment expense |
(2,635)
|
(494)
|
(264)
|
| Fair value change on forward exchange derivatives |
(145)
|
(422)
|
(8)
|
| Loss from operations |
(4,385)
|
(1,453)
|
(952)
|
| Net finance costs |
(1,305)
|
(911)
|
(1,064)
|
| Loss before taxation |
(4,470)
|
(1,546)
|
(1,060)
|
| Income tax expense |
(11,150)
|
(4,774)
|
(5,529)
|
| Loss after taxation |
(5,797)
|
(1,305)
|
(818)
|
| Balance sheet movement |
|
|
|
| Trade and other payables |
(1,201)
|
755
|
(406)
|
| Cash flow statement |
|
|
|
| Loss before taxation |
(4,470)
|
(1,546)
|
(1,060)
|
| Adjustments for: |
|
|
|
| Samarco impairment expense |
2,635
|
494
|
264
|
| Fair value change on forward exchange derivatives |
145
|
422
|
8
|
| Net finance costs |
1,305
|
911
|
1,064
|
| Changes in assets and liabilities: |
|
|
|
| Trade and other payables |
1,201
|
(755)
|
406
|
| Net operating cash flows |
27,234
|
15,706
|
17,871
|
| Net investing cash flows |
(7,845)
|
(7,616)
|
2,607
|
| Samarco dam failure [member] |
|
|
|
| Income statement |
|
|
|
| Other income |
34
|
489
|
50
|
| Expenses excluding net finance costs: |
|
|
|
| Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure |
(46)
|
(64)
|
(57)
|
| Loss from equity accounted investments, related impairments and expenses: |
|
|
|
| Samarco impairment expense |
(111)
|
(95)
|
(96)
|
| Samarco Germano dam decommissioning |
(15)
|
46
|
(263)
|
| Samarco dam failure provision |
(1,000)
|
(459)
|
(586)
|
| Fair value change on forward exchange derivatives |
136
|
|
|
| Loss from operations |
(1,002)
|
(83)
|
(952)
|
| Net finance costs |
(85)
|
(93)
|
(108)
|
| Loss before taxation |
(1,087)
|
(176)
|
(1,060)
|
| Income tax expense |
(71)
|
|
|
| Loss after taxation |
(1,158)
|
(176)
|
(1,060)
|
| Balance sheet movement |
|
|
|
| Trade and other payables |
(5)
|
(5)
|
4
|
| Derivatives |
136
|
|
|
| Tax liabilities |
(71)
|
|
|
| Provisions |
(741)
|
(137)
|
(629)
|
| Net liabilities |
(681)
|
(142)
|
(625)
|
| Cash flow statement |
|
|
|
| Loss before taxation |
(1,087)
|
(176)
|
(1,060)
|
| Adjustments for: |
|
|
|
| Samarco impairment expense |
111
|
95
|
96
|
| Samarco Germano dam decommissioning |
15
|
(46)
|
263
|
| Samarco dam failure provision |
1,000
|
459
|
586
|
| Fair value change on forward exchange derivatives |
(136)
|
|
|
| Net finance costs |
85
|
93
|
108
|
| Changes in assets and liabilities: |
|
|
|
| Trade and other payables |
5
|
5
|
(4)
|
| Net operating cash flows |
(7)
|
430
|
(11)
|
| Net investment and funding of equity accounted investments |
(470)
|
(464)
|
(424)
|
| Net investing cash flows |
(470)
|
(464)
|
(424)
|
| Net decrease in cash and cash equivalents |
$ (477)
|
$ (34)
|
$ (435)
|