Property, Plant and Equipment - Exploration and Production - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2013	Dec. 31, 2012
Capitalized Exploratory [Line Items]
Goodwill	$ 170
Assets retirement obligations and deferred income taxes reported in liabilities associated with assets held for sale	2,511	539
Pailin [Member] \| Thailand [Member]
Capitalized Exploratory [Line Items]
Corporation's proportionate interest in oil and gas assets (in percentage)	15.00%
Sinphuhorm [Member] \| Thailand [Member]
Capitalized Exploratory [Line Items]
Corporation's proportionate interest in oil and gas assets (in percentage)	35.00%
Pangkah [Member] \| Indonesia [Member]
Capitalized Exploratory [Line Items]
Corporation's proportionate interest in oil and gas assets (in percentage)	75.00%
Natuna [Member] \| Indonesia [Member]
Capitalized Exploratory [Line Items]
Corporation's proportionate interest in oil and gas assets (in percentage)	23.00%
Exploration and Production [Member]
Capitalized Exploratory [Line Items]
Carrying amount of properties classified as held for sale	1,670
Goodwill	170
Assets retirement obligations and deferred income taxes reported in liabilities associated with assets held for sale	$ 474

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Corporation's proportionate interest in oil and gas assets.

+ References

No definition available.

+ Details

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- Definition

Represents the sum of the carrying value of all the Assets Held-for-Sale at the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

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- Definition

Amount of other (increase) decrease of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

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- Definition

Liability (such as a mortgage) related to a disposal group that is held for sale and anticipated to be sold in less than one year. The liability is expected to be discharged as part of the plan of sale for the asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.15)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760

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