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Goodwill And Other Intangible Assets (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Finite-Lived Intangible Assets [Line Items]      
Amortization expense related to the intangible assets $ 86 $ 86 $ 85
Amortization Expenses Minimum [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Expected amortization for the year 2012 80    
Expected amortization for the year 2013 80    
Expected amortization for the year 2014 80    
Expected amortization for the year 2015 80    
Expected amortization for the year 2016 80    
Amortization Expenses Maximum [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Expected amortization for the year 2012 90    
Expected amortization for the year 2013 90    
Expected amortization for the year 2014 90    
Expected amortization for the year 2015 90    
Expected amortization for the year 2016 $ 90