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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 (excludes amortization through June 30, 2017) $ 85  
2018 158  
2019 149  
2020 127  
2021 118  
Subsequent years 596  
Net Carrying Amount $ 1,233 $ 1,126