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Derivatives And Hedging Activities Fair Value of Derivative Instruments (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Gross amount of recognized asset derivatives $ 4,000,000 $ 5,000,000
Gross amount of recognized liability derivatives 130,000,000 109,000,000
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Gross amount of recognized asset derivatives 3,000,000 1,000,000
Gross amount of recognized liability derivatives 6,000,000 1,000,000
Commodity Derivative | Designated as Hedging Instrument | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Gross amount of recognized asset derivatives 0 0
Commodity Derivative | Designated as Hedging Instrument | Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Gross amount of recognized liability derivatives 39,000,000 19,000,000
Commodity Derivative | Designated as Hedging Instrument | Other Long-Term Assets    
Derivatives, Fair Value [Line Items]    
Gross amount of recognized asset derivatives 0 0
Commodity Derivative | Designated as Hedging Instrument | Other Long-Term Liabilities    
Derivatives, Fair Value [Line Items]    
Gross amount of recognized liability derivatives 10,000,000 8,000,000
Commodity Derivative | Not Designated as Hedging Instrument | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Gross amount of recognized asset derivatives 0  
Commodity Derivative | Not Designated as Hedging Instrument | Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Gross amount of recognized liability derivatives 2,000,000  
Foreign Currency Derivative | Designated as Hedging Instrument | Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Gross amount of recognized asset derivatives [1] 3,000,000 3,000,000
Gross amount of recognized liability derivatives [1] 69,000,000 48,000,000
Net amount of derivative liability presented in the Balance Sheet [1] (66,000,000) (45,000,000)
Foreign Currency Derivative | Designated as Hedging Instrument | Other Long-Term Liabilities    
Derivatives, Fair Value [Line Items]    
Gross amount of recognized asset derivatives [1] 1,000,000 2,000,000
Gross amount of recognized liability derivatives [1] 12,000,000 34,000,000
Net amount of derivative liability presented in the Balance Sheet [1] (11,000,000) (32,000,000)
Foreign Currency Derivative | Not Designated as Hedging Instrument | Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Gross amount of recognized asset derivatives [1] 2,000,000 1,000,000
Gross amount of recognized liability derivatives [1] 3,000,000 1,000,000
Net amount of derivative liability presented in the Balance Sheet [1] (1,000,000) $ 0
Foreign Currency Derivative | Not Designated as Hedging Instrument | Other Long-Term Liabilities    
Derivatives, Fair Value [Line Items]    
Gross amount of recognized asset derivatives [1] 1,000,000  
Gross amount of recognized liability derivatives [1] 1,000,000  
Net amount of derivative liability presented in the Balance Sheet [1] $ 0  
[1] Derivative instruments within this category are subject to master netting arrangements and are presented on a net basis in the consolidated balance sheets in accordance with accounting guidance related to the offsetting of amounts related to certain contracts.