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Exceptional Items - Summary of Exceptional Items by Category (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2022
Disclosure of exceptional items [line items]      
Exceptional items gross $ (142) $ (822) $ (620)
Exceptional items tax 2 (422) (454)
Exceptional items net (140) (1,244) (1,074)
Samarco dam failure [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross (142) (822) (1,032)
Exceptional items tax 2 1 (31)
Exceptional items net (140) (821) (1,063)
Impairment of US deferred tax assets [Member]      
Disclosure of exceptional items [line items]      
Exceptional items tax   (423) (423)
Exceptional items net   (423) (423)
Corporate structure unification costs [Member]      
Disclosure of exceptional items [line items]      
Exceptional items gross     (428)
Exceptional items net     (428)
BHP Mitsui Coal (BMC) gain on disposal [Member]      
Disclosure of exceptional items [line items]      
Exceptional items gross     840
Exceptional items net     840
Attributable to BHP shareholders [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross (142) (822) (620)
Exceptional items tax 2 (422) (454)
Exceptional items net $ (140) $ (1,244) $ (1,074)