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Capitalised Costs Relating to Oil and Gas Production Activities (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Capitalized costs relating to oil and gas producing activities, by geographic area [Line Items]
Net capitalised costs	$ 21,821	$ 23,936	$ 25,389
United States [member]
Capitalized costs relating to oil and gas producing activities, by geographic area [Line Items]
Net capitalised costs	14,976	16,152	17,339
United States [member] | Discontinued Operations - Onshore US Cash Generating Units [Member]
Capitalized costs relating to oil and gas producing activities, by geographic area [Line Items]
Net capitalised costs	$ 10,672	$ 11,803	$ 12,844

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- Definition

Net amount of capitalized costs relating to oil and gas producing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447

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- Definition

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+ References

No definition available.

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