Fair Value Of Financial Instruments Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative, Fair Value, Net $ (110)   $ (104)
Total debt, recorded amount 2,717   2,451
Total debt, fair value 2,810   2,567
Asset Impairment Charges 2    
Impairment loss on KDAC interest 88    
Fair Value, Measurements, Nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Asset Impairment Charges 2 0  
Fair Value, Inputs, Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total debt, fair value $ 2,810   $ 2,567