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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 (excludes amortization through September 30, 2019) $ 95  
2020 354  
2021 343  
2022 327  
2023 320  
Subsequent years 1,430  
Net Carrying Amount $ 2,869 $ 1,437