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Derivative Instruments and Hedging Activities - Part 1 (Details)
In Millions, unless otherwise specified
 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Chilean Peso CLP [Member]
Jun. 30, 2013
Brazilian Real BRL [Member]
Jun. 30, 2013
Euro EUR [Member]
Jun. 30, 2013
Colombian Peso COP [Member]
Jun. 30, 2013
Argentine Peso ARS [Member]
Jun. 30, 2013
British Pound GBP [Member]
Jun. 30, 2013
Interest rate derivatives [Member]
Libor USD [Member]
Jun. 30, 2013
Interest rate derivatives [Member]
Euribor EUR [Member]
Jun. 30, 2013
Interest rate derivatives [Member]
Libor GBP [Member]
Jun. 30, 2013
Interest rate derivatives [Member]
Current Notional [Member]
Libor USD [Member]
USD ($)
Jun. 30, 2013
Interest rate derivatives [Member]
Current Notional [Member]
Euribor EUR [Member]
USD ($)
Jun. 30, 2013
Interest rate derivatives [Member]
Current Notional [Member]
Euribor EUR [Member]
EUR (€)
Jun. 30, 2013
Interest rate derivatives [Member]
Current Notional [Member]
Libor GBP [Member]
USD ($)
Jun. 30, 2013
Interest rate derivatives [Member]
Current Notional [Member]
Libor GBP [Member]
GBP (£)
Jun. 30, 2013
Interest rate derivatives [Member]
Maximum [Member]
Libor USD [Member]
USD ($)
Jun. 30, 2013
Interest rate derivatives [Member]
Maximum [Member]
Euribor EUR [Member]
USD ($)
Jun. 30, 2013
Interest rate derivatives [Member]
Maximum [Member]
Euribor EUR [Member]
EUR (€)
Jun. 30, 2013
Interest rate derivatives [Member]
Maximum [Member]
Libor GBP [Member]
USD ($)
Jun. 30, 2013
Interest rate derivatives [Member]
Maximum [Member]
Libor GBP [Member]
GBP (£)
Jun. 30, 2013
Cross currency derivatives [Member]
Chilean Unidad De Fomento CLF [Member]
Jun. 30, 2013
Cross currency derivatives [Member]
Current Notional [Member]
Chilean Unidad De Fomento CLF [Member]
USD ($)
Jun. 30, 2013
Cross currency derivatives [Member]
Current Notional [Member]
Chilean Unidad De Fomento CLF [Member]
CLF
Jun. 30, 2013
Cross currency derivatives [Member]
Maximum [Member]
Chilean Unidad De Fomento CLF [Member]
USD ($)
Jun. 30, 2013
Cross currency derivatives [Member]
Maximum [Member]
Chilean Unidad De Fomento CLF [Member]
CLF
Jun. 30, 2013
Foreign Currency Options [ Member]
Chilean Unidad De Fomento CLF [Member]
USD ($)
Jun. 30, 2013
Foreign Currency Options [ Member]
Chilean Unidad De Fomento CLF [Member]
CLP
Jun. 30, 2013
Foreign Currency Options [ Member]
Chilean Peso CLP [Member]
USD ($)
Jun. 30, 2013
Foreign Currency Options [ Member]
Chilean Peso CLP [Member]
CLP
Jun. 30, 2013
Foreign Currency Options [ Member]
Brazilian Real BRL [Member]
USD ($)
Jun. 30, 2013
Foreign Currency Options [ Member]
Brazilian Real BRL [Member]
BRL
Jun. 30, 2013
Foreign Currency Options [ Member]
Euro EUR [Member]
USD ($)
Jun. 30, 2013
Foreign Currency Options [ Member]
Euro EUR [Member]
EUR (€)
Jun. 30, 2013
Foreign Currency Options [ Member]
Colombian Peso COP [Member]
USD ($)
Jun. 30, 2013
Foreign Currency Options [ Member]
Colombian Peso COP [Member]
COP
Jun. 30, 2013
Foreign Currency Options [ Member]
Argentine Peso ARS [Member]
USD ($)
Jun. 30, 2013
Foreign Currency Options [ Member]
Argentine Peso ARS [Member]
ARS
Jun. 30, 2013
Foreign Currency Options [ Member]
British Pound GBP [Member]
USD ($)
Jun. 30, 2013
Foreign Currency Options [ Member]
British Pound GBP [Member]
GBP (£)
Jun. 30, 2013
Embedded Foreign Currency Derivatives [Member]
Euro EUR [Member]
USD ($)
Jun. 30, 2013
Embedded Foreign Currency Derivatives [Member]
Euro EUR [Member]
EUR (€)
Jun. 30, 2013
Embedded Foreign Currency Derivatives [Member]
Argentine Peso ARS [Member]
USD ($)
Jun. 30, 2013
Embedded Foreign Currency Derivatives [Member]
Argentine Peso ARS [Member]
ARS
Jun. 30, 2013
Embedded Foreign Currency Derivatives [Member]
Kazakhstani Tenge KZT [Member]
USD ($)
Jun. 30, 2013
Embedded Foreign Currency Derivatives [Member]
Kazakhstani Tenge KZT [Member]
KZT
Jun. 30, 2013
Commodity Derivatives [Member]
Aluminum M Wh [Member]
MWh
Jun. 30, 2013
Commodity Derivatives [Member]
Power MWh [Member]
MWh
Derivative Tables [Line Items]                                                                                            
Notional Amount Of Interest Rate Derivatives                   $ 3,539 [1] $ 769 [1] € 591 [1] $ 104 [1] £ 68 [1] $ 5,043 [1] $ 770 [1] € 592 [1] $ 104 [1] £ 68 [1]                                                      
Weighted Average Remaining Term (less than 1 for Chilean Peso, Brazilian Real, Euro, Colombian Peso, Argentine Peso and British Pound) 1 year 1 year 1 year 1 year 1 year 1 year 9 years [1] 13 years [1] 7 years [1]                     8 years         1 year [2] 1 year [2]                         10 years [2] 10 years [2] 11 years [2] 11 years [2] 4 years [2] 4 years [2] 7 years [3],[4] 2 years [4]
Weighted Average Remaining Term (string type)                                                     <1 [2] <1 [2] <1 [2] <1 [2] <1 [2] <1 [2] <1 [2] <1 [2] <1 [2] <1 [2] <1 [2] <1 [2]                
% of Debt Currently Hedged by Index             73.00% [1],[5] 65.00% [1],[5] 83.00% [1],[5]                     85.00% [5]                                                    
Notional Amount Of Foreign Currency Derivatives                                         252   252   255 6 [6] 91 46,233 [6] 47 104 [6] 45 35 [6] 97 179,416 [6] 15 83 [6] 43 28 [6] 2 1 [6] 152 821 [6] 5 811 [6]    
Notional (CLF)                                           6   6                                            
Notional (MWh)                                                                                         13,000,000 [3] 9,000,000
[1] The Company’s interest rate derivative instruments primarily include accreting and amortizing notionals. The maximum derivative notional represents the largest notional at any point between June 30, 2013 and the maturity of the derivative instrument, which includes forward-starting derivative instruments. The interest rate and cross currency derivatives range in maturity through 2030 and 2028, respectively.
[2] Represents the remaining tenor of our foreign currency derivatives weighted by the corresponding notional. These options and forwards and these embedded derivatives range in maturity through 2016 and 2026, respectively.
[3] Our exposure is to fluctuations in the price of aluminum while the notional is based on the amount of power we sell under the power purchase agreement ("PPA").
[4] Represents the remaining tenor of our commodity derivatives weighted by the corresponding volume. These derivatives range in maturity through 2019.
[5] The percentage of variable-rate debt currently hedged is based on the related index and excludes forecasted issuances of debt and variable-rate debt tied to other indices where the Company has no interest rate derivatives.
[6] Represents contractual notionals. The notionals for options have not been probability adjusted, which generally would decrease them.