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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 195  
2020 176  
2021 164  
2022 149  
2023 141  
Subsequent years 612  
Net Carrying Amount $ 1,437 $ 1,274