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Interests in Joint Operations - Summary of Significant Interests in Joint Operations (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2021
Nov. 06, 2020
Disclosure of joint operations [line items]    
Percentage of ownership interests in joint operations 50.00%  
Acquisition of additional proportion of ownership interest In joint operation   28.00%
Shenzi [member]    
Disclosure of joint operations [line items]    
Acquisition of additional proportion of ownership interest In joint operation 28.00%  
Purchase price   $ 480
Goodwill recognized   0
Property, plant and equipment recognised as of acquisition date   642
Inventory recognised as of acquisition date   17
Rehabilitation liabilities as of acquisition date   $ 179