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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]    
2016 (excludes amortization through September 30, 2016) $ 34  
2017 118  
2018 115  
2019 112  
2020 92  
Subsequent years 436  
Net Carrying Amount $ 907 $ 1,036