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Discontinued Operations - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2018
Sep. 28, 2018
Jan. 01, 2018
Dec. 31, 2017
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure of analysis of single amount of discontinued operations [line items]              
Total comprehensive income (loss) attributable to BHP shareholders         $ 7,898 $ 8,282 $ 3,608
Exceptional items net         $ 1,305 $ 818 $ 2,970
US corporate tax rate         30.00% 30.00% 30.00%
Taxation (income) charges related to exceptional items         $ 241 $ 242 $ (2,320)
US tax reform [member]              
Disclosure of analysis of single amount of discontinued operations [line items]              
Exceptional items net             2,320
US corporate tax rate     21.00% 35.00%      
Taxation (income) charges related to exceptional items             (2,320)
BHP Billiton Petroleum (Arkansas) Inc. [member]              
Disclosure of analysis of single amount of discontinued operations [line items]              
Percentage of issued share capital sold   100.00%          
BHP Billiton Petroleum (Fayetteville) LLC [member]              
Disclosure of analysis of single amount of discontinued operations [line items]              
Percentage of issued share capital sold   100.00%          
BHP Billiton Petroleum Arkansas and BHP Billiton Petroleum Fayetteville LLC [member]              
Disclosure of analysis of single amount of discontinued operations [line items]              
Agreement purchase price   $ 300          
Petrohawk Energy Corporation [member]              
Disclosure of analysis of single amount of discontinued operations [line items]              
Percentage of issued share capital sold 100.00%            
Agreement purchase price $ 10,300            
Customary completion adjustments $ (200)            
Discontinued operations [member]              
Disclosure of analysis of single amount of discontinued operations [line items]              
Total comprehensive income (loss) attributable to BHP shareholders           (342) (2,943)
Exceptional items net           $ 0 2,258
Taxation (income) charges related to exceptional items             601
Discontinued operations [member] | US tax reform [member]              
Disclosure of analysis of single amount of discontinued operations [line items]              
Exceptional items net             (492)
Taxation (income) charges related to exceptional items             $ 492