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Exceptional Items - Summary of Exceptional Items by Category (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]      
Exceptional items gross $ (784) $ (210) $ (1,060)
Exceptional items tax 271 242 242
Exceptional items net (513) 32 (818)
Samarco dam failure [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross (6) [1] (210) (1,060)
Exceptional items tax 0    
Exceptional items net (6) (210) (1,060)
Cancellation Of Power Contracts [Member]      
Disclosure of exceptional items [line items]      
Exceptional items gross (778)    
Exceptional items tax 271    
Exceptional items net (507)    
Global taxation matters [member]      
Disclosure of exceptional items [line items]      
Exceptional items tax   242 242
Exceptional items net   242 242
Non-controlling interests [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross (282)   0
Exceptional items tax 87   0
Exceptional items net (195)   0
Attributable to BHP shareholders [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross (502) (210) (1,060)
Exceptional items tax 184 242 242
Exceptional items net $ (318) $ 32 $ (818)
[1] Refer to note 9 Significant events – Samarco dam failure for further information.