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Derivatives and Other Financial Instruments - Schedule of Fair Values and Corresponding Level of Fair Value Hierarchy of Outstanding Derivative Contracts Recorded as Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Fair value liability derivatives	$ 446	$ 479
Level 1 [Member]
Derivative [Line Items]
Fair value liability derivatives	15	66
Level 3 [Member]
Derivative [Line Items]
Fair value liability derivatives	437	431
Derivatives Designated as Hedging Instruments [Member]
Derivative [Line Items]
Fair value liability derivatives	427	469
Derivatives Designated as Hedging Instruments [Member] | Other Current Liabilities [Member] | Aluminum Contracts [Member] | Level 1 [Member]
Derivative [Line Items]
Fair value liability derivatives	9	45
Derivatives Designated as Hedging Instruments [Member] | Other Current Liabilities [Member] | Aluminum Contracts [Member] | Level 3 [Member]
Derivative [Line Items]
Fair value liability derivatives	29	23
Derivatives Designated as Hedging Instruments [Member] | Other Current Liabilities [Member] | Energy Contracts [Member] | Level 1 [Member]
Derivative [Line Items]
Fair value liability derivatives	1
Derivatives Designated as Hedging Instruments [Member] | Other Noncurrent Liabilities and Deferred Credits [Member] | Aluminum Contracts [Member] | Level 1 [Member]
Derivative [Line Items]
Fair value liability derivatives	4	14
Derivatives Designated as Hedging Instruments [Member] | Other Noncurrent Liabilities and Deferred Credits [Member] | Aluminum Contracts [Member] | Level 3 [Member]
Derivative [Line Items]
Fair value liability derivatives	378	387
Derivatives Designated as Hedging Instruments [Member] | Other Noncurrent Liabilities and Deferred Credits [Member] | Energy Contracts [Member] | Level 3 [Member]
Derivative [Line Items]
Fair value liability derivatives	6
Derivatives Not Designated as Hedging Instruments [Member]
Derivative [Line Items]
Fair value liability derivatives	25	28
Derivatives Not Designated as Hedging Instruments [Member] | Other Current Liabilities [Member] | Aluminum Contracts [Member] | Level 1 [Member]
Derivative [Line Items]
Fair value liability derivatives	1	4
Derivatives Not Designated as Hedging Instruments [Member] | Other Current Liabilities [Member] | Embedded Credit Derivative [Member] | Level 3 [Member]
Derivative [Line Items]
Fair value liability derivatives	3	2
Derivatives Not Designated as Hedging Instruments [Member] | Other Current Liabilities [Member] | Foreign Exchange Contracts [Member] | Level 1 [Member]
Derivative [Line Items]
Fair value liability derivatives		3
Derivatives Not Designated as Hedging Instruments [Member] | Other Noncurrent Liabilities and Deferred Credits [Member] | Embedded Credit Derivative [Member] | Level 3 [Member]
Derivative [Line Items]
Fair value liability derivatives	21	19
Margin Posted [Member] | Subtotal [Member]
Derivative [Line Items]
Fair value liability derivatives	6	18
Margin Posted [Member] | Other Current Liabilities [Member] | Aluminum Contracts [Member] | Level 1 [Member]
Derivative [Line Items]
Fair value liability derivatives	5	18
Margin Posted [Member] | Other Noncurrent Liabilities and Deferred Credits [Member] | Aluminum Contracts [Member] | Level 1 [Member]
Derivative [Line Items]
Fair value liability derivatives	$ 1

X

- 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 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312



Reference 2: 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=35706170&loc=SL5624163-113959



Reference 3: 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=36459792&loc=SL20226000-175313

+ Details

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

X

- Details

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