Property, Plant and Equipment - Assets Held for Sale - Additional Information (Detail) (USD $) In Millions, unless otherwise specified			12 Months Ended
Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2013 Exploration and Production [Member]	Dec. 31, 2013 Pangkah [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Carrying amount of properties classified as held for sale			$ 1,097
Goodwill allocated	1,858	1,869	76
Corporation's proportionate interest in oil and gas assets (in percentage)				75.00%
Assets retirement obligations and deferred income taxes reported in Liabilities associated with assets held for sale			$ 286

Corporation's proportionate interest in oil and gas assets.

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- Definition

Amount classified as assets attributable to disposal group held for sale or disposed of.

+ References

+ Details

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- Definition

Amount after accumulated impairment loss of an asset representing 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

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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- Definition

Amount classified as liabilities attributable to disposal group held for sale or disposed of.

+ References

Reference 1: 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 2: 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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