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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 (excludes amortization through March 31, 2019) $ 151  
2020 187  
2021 174  
2022 159  
2023 156  
Subsequent years 637  
Net Carrying Amount $ 1,464 $ 1,437