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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]    
2016 (excludes amortization through March 31, 2016) $ 87  
2017 123  
2018 121  
2019 116  
2020 120  
Subsequent years 468  
Net Carrying Amount $ 1,035 $ 1,036