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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)