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Ageing of Capitalised Exploratory Well Costs (Detail) $ in Millions	Jun. 30, 2018 USD ($) Project	Jun. 30, 2017 USD ($) Project	Jun. 30, 2016 USD ($) Project	Jun. 30, 2015 USD ($)
Capitalized Exploratory Well Costs [Abstract]
Exploratory well costs capitalised for a period of one year or less	$ 124	$ 120	$ 262
Exploratory well costs capitalised for a period greater than one year	670	548	508
At the end of the year	$ 794	$ 668	$ 770	$ 484
Number of projects that have been capitalised for a period greater than one year | Project	17	14	23

X

- Definition

The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447

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- References

No definition available.

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X

- Definition

The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 1B
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447

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X

- Definition

The amount of exploratory well costs that have been capitalized for a period of one year or less after the completion of drilling.

+ References

No definition available.

+ Details

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X

- Definition

The number of projects for which exploratory well costs have been capitalized for a period of greater than one year after the completion of drilling.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 1B
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447

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