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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 180  
2019 170  
2020 149  
2021 139  
2022 125  
Subsequent years 511  
Net Carrying Amount $ 1,274 $ 1,126