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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
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Jun. 30, 2014 Interest rate derivatives [Member] Libor USD [Member] | Jun. 30, 2014 Interest rate derivatives [Member] Euribor EUR [Member] | Jun. 30, 2014 Interest rate derivatives [Member] Libor GBP [Member] | Jun. 30, 2014 Interest rate derivatives [Member] Maximum [Member] Libor USD [Member] USD ($) | Jun. 30, 2014 Interest rate derivatives [Member] Maximum [Member] Euribor EUR [Member] USD ($) | Jun. 30, 2014 Interest rate derivatives [Member] Maximum [Member] Euribor EUR [Member] EUR (€) | Jun. 30, 2014 Interest rate derivatives [Member] Maximum [Member] Libor GBP [Member] USD ($) | Jun. 30, 2014 Interest rate derivatives [Member] Maximum [Member] Libor GBP [Member] GBP (£) | Jun. 30, 2014 Interest rate derivatives [Member] Current Notional [Member] Libor USD [Member] USD ($) | Jun. 30, 2014 Interest rate derivatives [Member] Current Notional [Member] Euribor EUR [Member] USD ($) | Jun. 30, 2014 Interest rate derivatives [Member] Current Notional [Member] Euribor EUR [Member] EUR (€) | Jun. 30, 2014 Interest rate derivatives [Member] Current Notional [Member] Libor GBP [Member] USD ($) | Jun. 30, 2014 Interest rate derivatives [Member] Current Notional [Member] Libor GBP [Member] GBP (£) | Jun. 30, 2014 Cross currency derivatives [Member] Chilean Unidad De Fomento CLF [Member] | Jun. 30, 2014 Cross currency derivatives [Member] Maximum [Member] Chilean Unidad De Fomento CLF [Member] USD ($) | Jun. 30, 2014 Cross currency derivatives [Member] Maximum [Member] Chilean Unidad De Fomento CLF [Member] CLF | Jun. 30, 2014 Cross currency derivatives [Member] Current Notional [Member] Chilean Unidad De Fomento CLF [Member] USD ($) | Jun. 30, 2014 Cross currency derivatives [Member] Current Notional [Member] Chilean Unidad De Fomento CLF [Member] CLF | Jun. 30, 2014 Foreign Currency Options [ Member] Chilean Unidad De Fomento CLF [Member] USD ($) | Jun. 30, 2014 Foreign Currency Options [ Member] Chilean Unidad De Fomento CLF [Member] CLF | Jun. 30, 2014 Foreign Currency Options [ Member] Chilean Peso CLP [Member] USD ($) | Jun. 30, 2014 Foreign Currency Options [ Member] Chilean Peso CLP [Member] CLP | Jun. 30, 2014 Foreign Currency Options [ Member] Brazilian Real BRL [Member] USD ($) | Jun. 30, 2014 Foreign Currency Options [ Member] Brazilian Real BRL [Member] BRL | Jun. 30, 2014 Foreign Currency Options [ Member] Euro EUR [Member] USD ($) | Jun. 30, 2014 Foreign Currency Options [ Member] Euro EUR [Member] EUR (€) | Jun. 30, 2014 Foreign Currency Options [ Member] Colombian Peso COP [Member] USD ($) | Jun. 30, 2014 Foreign Currency Options [ Member] Colombian Peso COP [Member] COP | Jun. 30, 2014 Foreign Currency Options [ Member] Argentine Peso ARS [Member] | Jun. 30, 2014 Foreign Currency Options [ Member] British Pound GBP [Member] USD ($) | Jun. 30, 2014 Foreign Currency Options [ Member] British Pound GBP [Member] GBP (£) | Jun. 30, 2014 Embedded Foreign Currency Derivatives [Member] Brazilian Real BRL [Member] USD ($) | Jun. 30, 2014 Embedded Foreign Currency Derivatives [Member] Brazilian Real BRL [Member] BRL | Jun. 30, 2014 Embedded Foreign Currency Derivatives [Member] Argentine Peso ARS [Member] USD ($) | Jun. 30, 2014 Embedded Foreign Currency Derivatives [Member] Argentine Peso ARS [Member] ARS | Jun. 30, 2014 Embedded Foreign Currency Derivatives [Member] British Pound GBP [Member] | Jun. 30, 2014 Embedded Foreign Currency Derivatives [Member] Kazakhstani Tenge KZT [Member] USD ($) | Jun. 30, 2014 Embedded Foreign Currency Derivatives [Member] Kazakhstani Tenge KZT [Member] KZT | Jun. 30, 2014 Commodity Derivatives [Member] Power MWh [Member] MWh | Jun. 30, 2014 Coal Metric Tons [Member] Power MWh [Member] T
Derivative Tables [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives, notional amount |  |  |  |  |  |  | $ 4,886 | [1] | $ 757 | [1] | € 553 | [1] | $ 111 | [1] | £ 65 | [1] | $ 3,154 | [1] | $ 756 | [1] | € 552 | [1] | $ 111 | [1] | £ 65 | [1] |  |  | $ 191 | 4 | $ 191 | 4 | $ 497 |  | 11 | [2] | $ 119 |  | 65,607 | [2] | $ 68 |  | 150 | [2] | $ 192 |  | € 140 | [2] | $ 103 |  | 193,684 | [2] |  | $ 105 |  | £ 61 | [2] | $ 37 |  | 81 | [2] | $ 99 |  | 809 | [2] |  | $ 26 |  | 4,783 | [2] |  |  |  |
Weighted Average Remaining Term (less than 1 for Chilean Peso, Brazilian Real, Euro, Colombian Peso, British Pound, and Philippine Peso) | 11 years | [1] | 8 years | [1] | 12 years | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 years |  |  |  |  |  | 1 year | [3] | 1 year | [3] | 1 year |  | 1 year |  | 1 year |  | 1 year |  | 1 year |  | 1 year |  | 1 year |  | 1 year |  | 1 year | 1 year |  | 1 year |  |  |  |  |  | 10 years | [3] | 10 years | [3] | 1 year | 2 years | [3] | 2 years | [3] | 3 years | [4] | 2 years | [4]
Weighted Average Remaining Term (string type) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | <1 | [3] | <1 | [3] | <1 | [3] | <1 | [3] | <1 | [3] | <1 | [3] | <1 | [3] | <1 | [3] |  | <1 | [3] | <1 | [3] | <1 | [3] | <1 | [3] |  |  |  |  |  |  |  |  |  |  |  |  |
% of Debt Currently Hedged by Index | 60.00% | [1],[5] | 83.00% | [1],[5] | 83.00% | [1],[5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67.00% | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional (MWh) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  | 1,000,000 |
[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, 2014 and the maturity of the derivative instrument, which includes forward-starting derivative instruments. The interest rate and cross currency derivatives range in maturity through 2033 and 2028, respectively.
[2] | Represents contractual notionals. The notionals for options have not been probability adjusted, which generally would decrease them.
[3] | 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 2017 and 2025, respectively.
[4] | Represents the remaining tenor of our commodity derivatives weighted by the corresponding volume. These derivatives range in maturity through 2016.
[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.

X
- Definition Average remaining period until maturity of the derivative contract, in string format. + References No definition available. + Details
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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + 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 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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- Definition Percentage of an entity's outstanding debt that is designated as a hedged item in cash flow, fair value, or net investment hedge. + References No definition available. + Details
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