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Fair Value of Financial Instruments Fair Value of Financial Instruments (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net $ 0 $ 0 $ 0 $ 0  
Cash Surrender Value, Fair Value Disclosure 27,000,000   27,000,000   $ 26,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 $ 0 0 $ 0  
Long-term Debt 2,259,000,000   2,259,000,000   2,501,000,000
Long-term Debt, Fair Value 2,568,000,000   2,568,000,000   2,901,000,000
Fair Value, Inputs, Level 2 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Long-term Debt, Fair Value 2,513,000,000   2,513,000,000   2,596,000,000
Fair Value, Inputs, Level 3 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Long-term Debt, Fair Value $ 55,000,000   $ 55,000,000   $ 305,000,000