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Significant Events - Summary of Financial Impacts of Samarco Dam Failure (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Expenses excluding net finance costs:      
Costs incurred directly by BHP Billiton Brasil and other BHP entities in relation to the Samarco dam failure $ (13,695) $ (13,697) $ (27,527)
Loss from equity accounted investments, related impairments and expenses:      
Samarco dam failure provision (70) (87) (429)
Net finance costs (533) (658) (1,245)
Loss before taxation (210) (210) (650)
Income tax benefit 242 (2,320) (2,320)
Loss after taxation 32 (2,530) (2,970)
Balance sheet movement      
Movement in Trade and other payables 297 (331) (719)
Cash flow statement      
Loss before taxation (210) (210) (650)
Samarco dam failure provision 70 87 429
Net finance costs 533 658 1,245
Changes in assets and liabilities      
Trade and other payables (297) 331 719
Net operating cash flows 7,274 7,343 18,461
Net investing cash flows 3,330 (2,446) (5,921)
Net decrease in cash and cash equivalents (7,527) (2,184) 1,650
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 (33) (29) (57)
Loss from equity accounted investments, related impairments and expenses:      
Share of loss relating to the Samarco dam failure (47) (50) (80)
Samarco dam failure provision (70) (87) (429)
Loss from operations (150) (166) (566)
Net finance costs (60) (44) (84)
Loss before taxation (210) (210) (650)
Income tax benefit
Loss after taxation (210) (210) (650)
Balance sheet movement      
Movement in Trade and other payables 2 (2) 4
Movement in Provisions 38 25 (228)
Net assets/(liabilities) 40 23 (224)
Cash flow statement      
Loss before taxation (210) (210) (650)
Share of loss relating to the Samarco dam failure 47 50 80
Samarco dam failure provision 70 87 429
Net finance costs 60 44 84
Changes in assets and liabilities      
Trade and other payables (2) 2 (4)
Net operating cash flows (35) (27) (61)
Net investment and funding of equity accounted investments (215) (206) (365)
Net investing cash flows (215) (206) (365)
Net decrease in cash and cash equivalents $ (250) $ (233) $ (426)