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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 (excludes amortization through March 31, 2018) $ 137  
2019 174  
2020 154  
2021 145  
2022 132  
Subsequent years 514  
Net Carrying Amount $ 1,256 $ 1,274