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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]    
2013 (excludes amortization through March 31, 2013) $ 52  
2014 67  
2015 66  
2016 55  
2017 51  
Subsequent years 156  
Net Carrying Amount $ 447 $ 469