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Costs Incurred Relating to Oil and Gas Property Acquisition, Exploration and Development Activities (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Costs incurred, oil and gas property acquisition, exploration, and development activities [Line Items]
Acquisitions of proved property	$ 0	$ 0	$ 0
Acquisitions of unproved property	9	74	64
Exploration	734	738	621
Development	1,777	1,412	1,866
Total costs	2,520	2,224	2,551
Australia [member]
Costs incurred, oil and gas property acquisition, exploration, and development activities [Line Items]
Acquisitions of proved property	0	0	0
Acquisitions of unproved property			22
Exploration	25	32	42
Development	195	360	412
Total costs	220	392	476
United States [member]
Costs incurred, oil and gas property acquisition, exploration, and development activities [Line Items]
Acquisitions of proved property	0	0	0
Acquisitions of unproved property	9	12	42
Exploration	418	471	385
Development	1,548	1,034	1,254
Total costs	1,975	1,517	1,681
Other countries [member]
Costs incurred, oil and gas property acquisition, exploration, and development activities [Line Items]
Acquisitions of proved property	0	0	0
Acquisitions of unproved property		62
Exploration	291	235	194
Development	34	18	200
Total costs	$ 325	$ 315	$ 394

X

- Definition

Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have proved reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 18
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62014-109447

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62038-109447

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- Definition

Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62038-109447

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 18
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62014-109447

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Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 18
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62014-109447

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Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 18
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62014-109447

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Amount of costs incurred related to oil and gas property acquisition, exploration and development activities, including capitalized costs and costs charged to expense.

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