Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

-Paragraph 4D

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

+ Details

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

- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

+ Details

Name:	us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4H

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959

+ Details

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

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix:	us-gaap_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_GainLossOnDerivativeInstrumentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeByNatureAxis=apc_InterestRateSwaps3Through8Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	apc_AdditionalDerivativeInformationAxis=apc_ModifiedInterestRateSwapForMandatoryTerminationDatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeByNatureAxis=apc_PermittedToOffsetGrossDerivativeAssetWithFinancialInstitutionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeByNatureAxis=apc_InterestRateSwaps6Through8Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	apc_AdditionalDerivativeInformationAxis=apc_ModifiedInterestRateSwapsForReferencePeriodDateExtensionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ReserveQuantitiesByTypeOfReserveAxis=us-gaap_NaturalGasReservesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TradingActivityByTypeAxis=us-gaap_CommodityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Derivative Instruments - Additional Information (Detail) Mcf in Millions, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) Mcf	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) Mcf
Derivative [Line Items]
(Gains) losses on derivatives, net	$ 281	$ (324)	$ 123	$ 462
Interest-Rate Derivatives [Member] \| (Gains) Losses on Derivatives, Net [Member]
Derivative [Line Items]
(Gains) losses on derivatives, net	407	$ 96	300	$ 493
Interest-Rate Derivatives [Member] \| Interest Rate Swaps 3 Through 8 [Member] \| Modified Interest-Rate Swaps for Mandatory Termination Dates [Member] \| (Gains) Losses on Derivatives, Net [Member]
Derivative [Line Items]
(Gains) losses on derivatives, net	137
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gross derivative liabilities	1,651		1,651		$ 1,455
Aggregate fair value of derivative instruments with credit-risk-related contingent features for which a net liability position existed (net of collateral)	1,300		1,300		97
Not Designated as Hedging Instrument [Member] \| Permitted to Offset Gross Derivative Asset with Financial Institutions [Member]
Derivative [Line Items]
Gross derivative liabilities	243		243		289
Not Designated as Hedging Instrument [Member] \| Interest-Rate Derivatives [Member]
Derivative [Line Items]
Gross derivative liabilities	1,518		1,518		1,217
Not Designated as Hedging Instrument [Member] \| Interest-Rate Derivatives [Member] \| Other Liabilities [Member]
Derivative [Line Items]
Gross derivative liabilities	1,462		1,462		$ 1,217
Not Designated as Hedging Instrument [Member] \| Interest-Rate Derivatives [Member] \| Interest Rate Swaps 6 Through 8 [Member] \| Modified Interest-Rate Swaps for Reference-Period Start Date Extensions [Member]
Derivative [Line Items]
Notional principal amount of interest-rate swap	1,000		1,000
Not Designated as Hedging Instrument [Member] \| Interest-Rate Derivatives [Member] \| Interest Rate Swaps 3 Through 8 [Member] \| Modified Interest-Rate Swaps for Mandatory Termination Dates [Member]
Derivative [Line Items]
Notional principal amount of interest-rate swap	1,800		1,800
Not Designated as Hedging Instrument [Member] \| Interest-Rate Derivatives [Member] \| Interest Rate Swaps 3 Through 8 [Member] \| Modified Interest-Rate Swaps for Mandatory Termination Dates [Member] \| Other Liabilities [Member]
Derivative [Line Items]
Gross derivative liabilities	$ 137		$ 137
Not Designated as Hedging Instrument [Member] \| Natural Gas [Member] \| Commodity [Member]
Derivative [Line Items]
Financial derivative transactions \| Mcf			8		6