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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 (excludes amortization through June 30, 2018) $ 94  
2019 173  
2020 154  
2021 143  
2022 132  
Subsequent years 538  
Net Carrying Amount $ 1,234 $ 1,274