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Results of Operations from Oil and Gas Producing Activities (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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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)

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- Details
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