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Exceptional Items - Summary of Exceptional Items Related to the Samarco Dam Failure (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Disclosure of exceptional items [line items]      
Other income $ 209 $ 170 $ 393
Expenses excluding net finance costs:      
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure (14,315) (13,695) (28,022)
Loss from equity accounted investments, related impairments and expenses:      
Samarco impairment expense (29) (168) (264)
Samarco dam failure provision 56 (70) (586)
Net finance costs (524) (533) (1,064)
Total (784) (210) (1,060)
Samarco dam failure [member]      
Disclosure of exceptional items [line items]      
Other income 40   50
Expenses excluding net finance costs:      
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure (25) (33) (57)
Loss from equity accounted investments, related impairments and expenses:      
Samarco impairment expense (27) (47) (96)
Samarco Germano dam decommissioning 7   (263)
Samarco dam failure provision 56 (70) (586)
Net finance costs (57) (60) (108)
Total $ (6) [1] $ (210) $ (1,060)
[1] Refer to note 9 Significant events – Samarco dam failure for further information.