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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 (excludes amortization through September 30, 2018) $ 51  
2019 183  
2020 168  
2021 157  
2022 143  
Subsequent years 627  
Net Carrying Amount $ 1,329 $ 1,274