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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]    
2013 (excludes amortization through June 30, 2013) $ 36  
2014 70  
2015 69  
2016 60  
2017 54  
Subsequent years 188  
Net Carrying Amount $ 477 $ 469