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Changes in the Standardised Measure (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Extractive Industries [Abstract]      
Standardised measure at the beginning of the year $ 9,152 $ 10,240 $ 8,242
Revisions:      
Prices, net of production costs (5,633) 3,821 5,540
Changes in future development costs 330 (228) (358)
Revisions of reserves quantity estimates (229) 1,268 (166)
Accretion of discount 1,313 1,178 1,016
Changes in production timing and other (310) (618) 946
Revisions 4,623 15,661 15,220
Sales of oil and gas, net of production costs (2,980) (5,029) (5,091)
Acquisitions of reserves-in-place 0 0 0
Sales of reserves-in-place 0 (1,489) (26)
Previously estimated development costs incurred 1,005 545 1,068
Extensions, discoveries, and improved recoveries, net of future costs 145 (33) 502
Changes in future income taxes 2,265 (503) (1,433)
Standardised measure at the end of the year $ 5,058 $ 9,152 $ 10,240