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Goodwill And Intangible Assets (Cost And Accumulated Amortization Of Intangible Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
Intangibles not subject to amortization $ 11 $ 11
Intangibles subject to amortization 115 126
Total intangibles 126 137
Accumulated amortization of intangibles (91) (96)
Net intangibles $ 35 $ 41