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Other Noncurrent Liabilities and Deferred Credits - Schedule of Other Noncurrent Liabilities and Deferred Credits (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Asset retirement obligations (C)	$ 587us-gaap_AssetRetirementObligationsNoncurrent	$ 544us-gaap_AssetRetirementObligationsNoncurrent
Environmental remediation (N)	473us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent	461us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent
Fair value of derivative contracts (X)	376us-gaap_DerivativeLiabilitiesNoncurrent	420us-gaap_DerivativeLiabilitiesNoncurrent
Accrued compensation and retirement costs	346us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent	342us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Income taxes (T)	330us-gaap_AccruedIncomeTaxesNoncurrent	403us-gaap_AccruedIncomeTaxesNoncurrent
Liability related to the resolution of a legal matter (N)	222us-gaap_LitigationReserveNoncurrent	296us-gaap_LitigationReserveNoncurrent
Contingent payment related to an acquisition (F)	130us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent
Deferred alumina sales revenue	93us-gaap_DeferredRevenueNoncurrent	101us-gaap_DeferredRevenueNoncurrent
Deferred credit related to derivative contract (X)	62us-gaap_OtherDeferredCreditsNoncurrent	157us-gaap_OtherDeferredCreditsNoncurrent
Other	230us-gaap_OtherSundryLiabilitiesNoncurrent	247us-gaap_OtherSundryLiabilitiesNoncurrent
Other noncurrent liabilities and deferred credits, total	$ 2,849us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent	$ 2,971us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent

X

- Definition

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

+ References

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-Publisher FASB

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-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.24)

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-Topic 410

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-Paragraph 10

-Subparagraph (d)(1)

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X

- Definition

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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-Paragraph 1

-Subparagraph (SX 210.5-02.24)

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-Name Regulation S-X (SX)

-Number 210

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X

- Definition

Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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-Paragraph 1

-Subparagraph (c)

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X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

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X

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

+ References

No definition available.

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X

- Definition

Carrying amount as of the balance sheet date of unearned revenue or income, not otherwise specified in the taxonomy, which is expected to be taken into income after one year or beyond the normal operating cycle, if longer and noncurrent obligations not separately disclosed in the balance sheet (other liabilities, noncurrent).

+ References

No definition available.

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X

- Definition

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

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X

- Definition

Fair value, after the 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, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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-Name Accounting Standards Codification

-Topic 825

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X

- Definition

Carrying amount of estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid after one year or beyond the normal operating cycle, if longer.

+ References

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- Definition

Carrying amount as of the balance sheet date of unearned revenue or income not otherwise specified in the taxonomy which is expected to be taken into income after one year or beyond the normal operating cycle, if longer.

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- Definition

Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are expected to be paid after one year (or the normal operating cycle, if longer), from the balance sheet date.

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