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Results of Operations from Oil and Gas Producing Activities (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Results of operations for oil and gas producing activities by geographic area [line items]      
Sales to affiliated companies $ 62 $ 75 $ 75
Valuation provision 12 21 596
Results of oil and gas producing activities 298 1,671 (935)
United States [member]      
Results of operations for oil and gas producing activities by geographic area [line items]      
Results of oil and gas producing activities 133 1,097 (1,446)
Discontinued operations - Onshore US Cash Generating Units [member] | United States [member]      
Results of operations for oil and gas producing activities by geographic area [line items]      
Results of oil and gas producing activities $ 0 $ 431 $ (465)