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Fair Value Measurements (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Inputs, Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt, Fair Value $ 2,700,000,000 $ 2,600,000,000
Fair Value, Measurements, Recurring
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds (1) 12,000,000 [1] 465,000,000 [1]
Net derivative contracts 16,000,000 (25,000,000)
Available for sale investments 103,000,000 18,000,000
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 (1) 12,000,000 [1] 465,000,000 [1]
Net derivative contracts 0 0
Available for sale investments 92,000,000 8,000,000
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 (1) 12,000,000 [1] 465,000,000 [1]
Net derivative contracts 0 0
Available for sale investments 103,000,000 18,000,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds (1) 0 [1] 0 [1]
Net derivative contracts 16,000,000 (25,000,000)
Available for sale investments $ 0 $ 0
[1] Money market funds are comprised primarily of government obligations and other first tier obligations.