Name:	apc_AllocationOfFaultAssignedInPhaseOneFindingsAndConclusions
Namespace Prefix:	apc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Barrels of oil discharged into the Gulf of Mexico used for purposes of calculating the maximum possible civil penalty under the Clean Water Act, as determined by the U.S. District Court in New Orleans, Louisiana.

No definition available.

Name:	apc_BarrelsOfOilDischarged
Namespace Prefix:	apc_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	duration

Non-operating leasehold interest ownership percentage.

No definition available.

Name:	apc_NonOperatedInterestPercentage
Namespace Prefix:	apc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

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

Amount of loss contingency liability.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer.

Name:	us-gaap_LossContingencyAccrualCarryingValueCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.