Name:	apc_DefinedBenefitPlanTargetAllocationPercentageOfAssetsFixedIncomeRangeMaximum
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Data Type:	num:percentItemType
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Target allocation minimum percentage of fixed income investments to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

Name:	apc_DefinedBenefitPlanTargetAllocationPercentageOfAssetsFixedIncomeRangeMinimum
Namespace Prefix:	apc_
Data Type:	num:percentItemType
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Period Type:	duration

Target allocation maximum percentage in other than debt securities, equity securities, and fixed income investments to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

Name:	apc_DefinedBenefitPlanTargetAllocationPercentageOfOtherAssetsRangeMaximum
Namespace Prefix:	apc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DefinedBenefitPensionPlansAndDefinedBenefitPostretirementPlansDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The amount of employer securities or securities of parties related to the employer that are included in plan assets.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph n

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (n)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanAmountOfEmployerAndRelatedPartySecuritiesIncludedInPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Target allocation maximum percentage of investments in equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

Name:	us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecuritiesRangeMaximum
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Target allocation minimum percentage of investments in equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.