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Derivative Instruments and Hedging Activities - Part 1 (Details) In Millions, unless otherwise specified |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 USD ($) | Dec. 31, 2012 Aluminum M Wh [Member] MWh | Dec. 31, 2012 Power MWh [Member] MWh | Dec. 31, 2012 Interest Rate Derivatives Libor USD [Member] | Dec. 31, 2012 Interest Rate Derivatives Euribor EUR [Member] | Dec. 31, 2012 Interest Rate Derivatives Libor GBP [Member] | Dec. 31, 2012 Interest Rate Derivatives Current [Member] Libor USD [Member] USD ($) | Dec. 31, 2012 Interest Rate Derivatives Current [Member] Euribor EUR [Member] USD ($) | Dec. 31, 2012 Interest Rate Derivatives Current [Member] Euribor EUR [Member] EUR (€) | Dec. 31, 2012 Interest Rate Derivatives Current [Member] Libor GBP [Member] USD ($) | Dec. 31, 2012 Interest Rate Derivatives Current [Member] Libor GBP [Member] GBP (£) | Dec. 31, 2012 Interest Rate Derivatives Maximum Libor USD [Member] USD ($) | Dec. 31, 2012 Interest Rate Derivatives Maximum Euribor EUR [Member] USD ($) | Dec. 31, 2012 Interest Rate Derivatives Maximum Euribor EUR [Member] EUR (€) | Dec. 31, 2012 Interest Rate Derivatives Maximum Libor GBP [Member] USD ($) | Dec. 31, 2012 Interest Rate Derivatives Maximum Libor GBP [Member] GBP (£) | Dec. 31, 2012 Cross Currency Swaps Chilean Unidad De Fomento CLF [Member] | Dec. 31, 2012 Cross Currency Swaps Current [Member] Chilean Unidad De Fomento CLF [Member] USD ($) | Dec. 31, 2012 Cross Currency Swaps Current [Member] Chilean Unidad De Fomento CLF [Member] CLF | Dec. 31, 2012 Cross Currency Swaps Maximum Chilean Unidad De Fomento CLF [Member] USD ($) | Dec. 31, 2012 Cross Currency Swaps Maximum Chilean Unidad De Fomento CLF [Member] CLF | Dec. 31, 2012 Foreign Currency Options and Forwards Euro EUR [Member] USD ($) | Dec. 31, 2012 Foreign Currency Options and Forwards Euro EUR [Member] EUR (€) | Dec. 31, 2012 Foreign Currency Options and Forwards Brazilian Real BRL [Member] USD ($) | Dec. 31, 2012 Foreign Currency Options and Forwards Brazilian Real BRL [Member] BRL | Dec. 31, 2012 Foreign Currency Options and Forwards British Pound GBP [Member] USD ($) | Dec. 31, 2012 Foreign Currency Options and Forwards British Pound GBP [Member] GBP (£) | Dec. 31, 2012 Foreign Currency Options and Forwards Chilean Peso CLP [Member] USD ($) | Dec. 31, 2012 Foreign Currency Options and Forwards Chilean Peso CLP [Member] CLP | Dec. 31, 2012 Foreign Currency Options and Forwards Colombian Peso COP [Member] USD ($) | Dec. 31, 2012 Foreign Currency Options and Forwards Colombian Peso COP [Member] COP | Dec. 31, 2012 Foreign Currency Options and Forwards Argentine Peso ARS [Member] USD ($) | Dec. 31, 2012 Foreign Currency Options and Forwards Argentine Peso ARS [Member] ARS | Dec. 31, 2012 Embedded Foreign Currency Derivatives Euro EUR [Member] USD ($) | Dec. 31, 2012 Embedded Foreign Currency Derivatives Euro EUR [Member] EUR (€) | Dec. 31, 2012 Embedded Foreign Currency Derivatives Argentine Peso ARS [Member] USD ($) | Dec. 31, 2012 Embedded Foreign Currency Derivatives Argentine Peso ARS [Member] ARS | Dec. 31, 2012 Embedded Foreign Currency Derivatives Kazakhstani Tenge KZT [Member] USD ($) | Dec. 31, 2012 Embedded Foreign Currency Derivatives Kazakhstani Tenge KZT [Member] KZT | Dec. 31, 2012 Commodity Derivatives Aluminum M Wh [Member] | Dec. 31, 2012 Commodity Derivatives Power MWh [Member]
Derivative Tables [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount Of Interest Rate Derivatives | $ 3,600 |  |  |  |  |  | $ 3,413 | $ 807 | € 611 | $ 109 | £ 67 | $ 4,272 | $ 807 | € 611 | $ 112 | £ 69 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Remaining Term |  |  |  | 10 years | 9 years | 12 years |  |  |  |  |  |  |  |  |  |  | 9 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year | 1 year | 11 years | 11 years | 11 years | 11 years | 4 years | 4 years | 7 years | 3 years
Weighted Average Remaining Term (string type) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | <1 | <1 | <1 | <1 | <1 | <1 | <1 | <1 | <1 | <1 |  |  |  |  |  |  |  |  |  |
% of Debt Currently Hedged by Index |  |  |  | 70.00% | 64.00% | 86.00% |  |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount Of Foreign Currency Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 126 | 98 | 83 | 175 | 27 | 17 | 108 | 52,575 | 49 | 89,928 | 20 | 118 | 2 | 2 | 173 | 849 | 8 | 1,195 |  |
Notional (CLF) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 267 | 6 | $ 267 | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional (MWh) |  | 14,000,000 | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate notional amount of foreign currency exchange rate derivatives denominated in Chilean Unidad de Fomento (CLF). Notional amount refers to the number of currency units specified in the foreign currency derivative contract. + References No definition available. + Details
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- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Aggregate notional amount of foreign currency exchange rate derivatives. Notional amount refers to the number of currency units specified in the foreign currency derivative contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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