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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
2015 (excludes amortization through September 30, 2015) $ 32  
2016 107  
2017 102  
2018 98  
2019 97  
Subsequent years 400  
Net Carrying Amount $ 836 $ 692