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Fair Value of Financial Instruments Fair Value of Financial Instruments (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Defined Benefit Plan, Transfers Between Measurement Levels $ 0 $ 0 $ 0 $ 0  
Cash Surrender Value, Fair Value Disclosure 26,000,000   26,000,000   26,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0    0 0  
Long-term Debt 2,321,000,000   2,321,000,000   1,916,000,000
Long-term Debt, Fair Value 2,632,000,000   2,632,000,000   2,074,000,000
Fair Value, Inputs, Level 2 [Member]
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Long-term Debt, Fair Value 2,327,000,000   2,327,000,000    
Fair Value, Inputs, Level 3 [Member]
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Long-term Debt, Fair Value $ 305,000,000   $ 305,000,000