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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
2016 $ 128  
2017 120  
2018 118  
2019 112  
2020 105  
Subsequent years 453  
Net Carrying Amount $ 1,036 $ 692