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Fair Value Measurements (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt, Fair Value $ 2,600,000,000 $ 2,600,000,000
Fair Value, Measurements, Recurring
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money Market Funds 60,000,000 [1] 563,000,000 [1]
Net Derivative Contracts (49,000,000) (14,000,000)
Available for Sale Investments 11,000,000 10,000,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Level 3 Assets and Liabilities 0 0
Fair Value, Measurements, Recurring | Total Cost Basis
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money Market Funds 60,000,000 [1] 563,000,000 [1]
Net Derivative Contracts 0 0
Available for Sale Investments 7,000,000 7,000,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money Market Funds 60,000,000 [1] 563,000,000 [1]
Net Derivative Contracts 0 0
Available for Sale Investments 11,000,000 10,000,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money Market Funds 0 [1] 0 [1]
Net Derivative Contracts (49,000,000) (14,000,000)
Available for Sale Investments $ 0 $ 0
[1] Money market funds are primarily comprised of government obligations.