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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]
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