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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 (excludes amortization through September 30, 2017) $ 50  
2018 176  
2019 166  
2020 145  
2021 135  
Subsequent years 648  
Net Carrying Amount $ 1,320 $ 1,126