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Results of Operations from Oil and Gas Producing Activities (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Results of operations for oil and gas producing activities by geographic area [line items]      
Sales to affiliated companies $ 51 $ 62 $ 75
Valuation provision 101 12 21
Results of oil and gas producing activities 251 298 1,671
Discontinued operations [member] | Onshore US [Member]      
Results of operations for oil and gas producing activities by geographic area [line items]      
Results of oil and gas producing activities $ 0 $ 0 $ 431