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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 (excludes amortization through March 31, 2017) $ 126  
2018 161  
2019 153  
2020 135  
2021 129  
Subsequent years 587  
Net Carrying Amount $ 1,291 $ 1,126