Goodwill And Other Intangibles (Narrative) (Details) $ in Millions	Dec. 31, 2017 USD ($)
Goodwill And Intangible Assets Disclosure [Line Items]
Intangibles subject to amortization, estimated amortization expense, next 12 months	$ 55
Intangibles subject to amortization, estimated amortization expense, year 2	52
Intangibles subject to amortization, estimated amortization expense, year 3	51
Intangibles subject to amortization, estimated amortization expense, year 4	51
Intangibles subject to amortization, estimated amortization expense, year 5	49
Intangibles subject to amortization, estimated amortization expense cumulatively thereafter	$ 217