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Changes in the Standardised Measure (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Extractive Industries [Abstract]      
Standardised measure at the beginning of the year $ 10,240 $ 8,242 $ 8,987
Revisions:      
Prices, net of production costs 3,821 5,540 (96)
Changes in future development costs (228) (358) 275
Revisions of reserves quantity estimates 1,268 (166) 2,961
Accretion of discount 1,178 1,016 1,147
Changes in production timing and other (618) 946 (1,611)
Revisions 15,661 15,220 11,663
Sales of oil and gas, net of production costs (5,029) (5,091) (4,301)
Acquisitions of reserves-in-place 0 0 0
Sales of reserves-in-place (1,489) (26) (15)
Previously estimated development costs incurred 545 1,068 718
Extensions, discoveries, and improved recoveries, net of future costs (33) 502 (401)
Changes in future income taxes (503) (1,433) 578
Standardised measure at the end of the year $ 9,152 $ 10,240 $ 8,242