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Derivatives And Other Financial Instruments (Fair Value Gains And Losses on Derivatives Contracts) (Details) (USD $) In Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | $ 4 | $ (35) | $ 32 | $ (53)
Sales [Member] | Aluminum Contracts [Member] |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | (10) | 7 | (9) | 3
Other Expenses (Income), Net [Member] | Aluminum Contracts [Member] |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | 18 | (33) | 7 | (18)
Other Expenses (Income), Net [Member] | Embedded Credit Derivative [Member] |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | (13) | 1 | (10) | (8)
Other Expenses (Income), Net [Member] | Energy Contract [Member] |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | 16 | (12) | 47 | (31)
Other Expenses (Income), Net [Member] | Foreign Exchange Contracts [Member] |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | $ (7) | $ 2 | $ (3) | $ 1

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- Definition The aggregate net gain (loss) on price risk derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration