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Movement in Capitalised Exploratory Well Costs (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Extractive Industries [Abstract]      
At the beginning of the year $ 794 $ 668 $ 770
Additions to capitalised exploratory well costs pending the determination of proved reserves 297 186 258
Capitalised exploratory well costs charged to expense (9) (62) (69)
Capitalised exploratory well costs reclassified to wells, equipment, and facilities based on the determination of proved reserves (42) 2 (155)
Other     (136)
At the end of the year $ 1,040 $ 794 $ 668