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Results of Operations from Oil and Gas Producing Activities (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Results of operations for oil and gas producing activities, by geographic area [Line Items]
Sales to affiliated companies	$ 75	$ 83	$ 118
Valuation provision	596	102	7,232
Results of oil and gas producing activities	(935)	1	(5,564)
United States [member]
Results of operations for oil and gas producing activities, by geographic area [Line Items]
Results of oil and gas producing activities	(1,446)	(520)	(5,904)
United States [member] | Discontinued Operations - Onshore US Cash Generating Units [Member]
Results of operations for oil and gas producing activities, by geographic area [Line Items]
Results of oil and gas producing activities	$ (465)	$ (564)	$ (5,855)

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Valuation provisions (impairments) related to oil and gas producing activities.

+ References

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- Definition

The results of operations for oil and gas producing activities, excluding corporate overhead and interest costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62299-109447

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 23
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447

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- Definition

Sales or transfers to the enterprises other operations from 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 24
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62246-109447

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