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Costs Incurred Relating to Oil and Gas Property Acquisition, Exploration and Development Activities (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Costs incurred oil and gas property acquisition exploration and development activities [line items]      
Acquisitions of proved property $ 642    
Acquisitions of unproved property 19 $ 44 $ 5
Exploration 499 686 726
Development 1,134 1,008 978
Total costs 2,294 1,738 1,709
Australia [member]      
Costs incurred oil and gas property acquisition exploration and development activities [line items]      
Exploration 23 38 44
Development 201 232 132
Total costs 224 270 176
United States [member]      
Costs incurred oil and gas property acquisition exploration and development activities [line items]      
Acquisitions of proved property 642    
Acquisitions of unproved property 19 38 5
Exploration 166 278 190
Development 749 676 792
Total costs 1,576 992 987
Other countries [member]      
Costs incurred oil and gas property acquisition exploration and development activities [line items]      
Acquisitions of unproved property   6  
Exploration 310 370 492
Development 184 100 54
Total costs $ 494 $ 476 $ 546