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Derivative Instruments and Hedging Activities (Foreign Currency Derivatives) (Details) - 12 months ended Dec. 31, 2015 € in Millions, £ in Millions, KZT in Millions, COP in Millions, CLP in Millions, CLF in Millions, BRL in Millions, ARS in Millions, $ in Millions | USD ($) | EUR (€) | [1] | COP | [1] | KZT | [1] | BRL | [1] | CLF | [1] | CLP | [1] | ARS | [1] | GBP (£) | [1]
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Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 3,200 |  |  |  |  |  |  |  |
Chilean Unidad De Fomento CLF | Foreign Exchange Option and Forward |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 311 |  |  |  |  | CLF 9 |  |  |
Derivative, average remaining maturity | [2] | 1 year |  |  |  |  |  |  |  |
Chilean Peso CLP | Foreign Exchange Option and Forward |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 119 |  |  |  |  |  | CLP 84,669 |  |
Derivative, average remaining maturity | [2] | 1 year |  |  |  |  |  |  |  |
Brazilian Real BRL | Foreign Exchange Option and Forward |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 21 |  |  |  | BRL 80 |  |  |  |
Derivative, average remaining maturity | [2] | 1 year |  |  |  |  |  |  |  |
Euro EUR | Foreign Exchange Option and Forward |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 35 | € 32 |  |  |  |  |  |  |
Derivative, average remaining maturity | [2] | 1 year |  |  |  |  |  |  |  |
Colombian Peso COP | Foreign Exchange Option and Forward |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 80 |  | COP 252,166 |  |  |  |  |  |
Derivative, average remaining maturity | [2] | 1 year |  |  |  |  |  |  |  |
Argentine Peso ARS | Foreign Exchange Option and Forward |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 178 |  |  |  |  |  |  | ARS 2,321 |
Derivative, average remaining maturity | [2] | 10 years |  |  |  |  |  |  |  |
British Pound GBP | Foreign Exchange Option and Forward |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 32 |  |  |  |  |  |  |  | £ 22
Derivative, average remaining maturity | [2] | 1 year |  |  |  |  |  |  |  |
Kazakhstani Tenge | Embedded Derivative Financial Instruments |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 5 |  |  | KZT 1,691 |  |  |  |  |
Derivative, average remaining maturity | [2] | 1 year |  |  |  |  |  |  |  |
[1] | (1) Represents contractual notionals. The notionals for options have not been probability adjusted, which generally would decrease them.
[2] | (2) Represents the remaining tenor of our foreign currency derivatives weighted by the corresponding notional. These derivatives matures through 2026.December 31, 2015 Weighted-AverageCommodity Derivatives Notional Remaining Term(1) (in millions) (in years)Power (MWh) 10 3

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + 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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