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

- Definition

Operated Interest

+ References

No definition available.

+ Details

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

- Definition

Third party nonoperated interest to be acquired.

+ References

No definition available.

+ Details

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

- Definition

Disclosure of the difference in values (gain (loss)) between the nonmonetary assets or liabilities exchanged with another entity inclusive of boot (small monetary consideration).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 845
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=68069686&loc=d3e32049-108421

+ Details

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

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

+ Details

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

- Details

Name:	us-gaap_NonmonetaryTransactionTypeAxis=apc_DelawareBasinJointVentureSystemMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=apc_WesternGasPartnersLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_NonmonetaryTransactionTypeAxis=apc_MarcellusAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Divestitures - Property Exchange (Detail) - USD ($) $ in Millions		9 Months Ended
	Mar. 17, 2017	Sep. 30, 2018	Sep. 30, 2017
Nonmonetary Transaction [Line Items]
Cash payment to acquire a third party's interest in the DBJV system		$ 4,891	$ 3,538
Delaware Basin Joint Venture System [Member]
Nonmonetary Transaction [Line Items]
Third party nonoperated interest percentage to be acquired	50.00%
Western Gas Partners, LP [Member] \| Delaware Basin Joint Venture System [Member]
Nonmonetary Transaction [Line Items]
Cash payment to acquire a third party's interest in the DBJV system	$ 155
Gain on exchange	$ 126
Operated interest percentage		100.00%
Western Gas Partners, LP [Member] \| Marcellus Assets [Member]
Nonmonetary Transaction [Line Items]
Non operated interest percentage	33.75%