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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)