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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 (excludes amortization through June 30, 2019) $ 194  
2020 371  
2021 359  
2022 345  
2023 336  
Subsequent years 1,478  
Net Carrying Amount $ 3,083 $ 1,437