Goodwill And Acquired Intangibles (Schedule of Finite-Lived Intangible Assets, Future Amortization Expense) (Details) $ in Millions	Dec. 31, 2015 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2015 estimated amortization expense	$ 211
2016 estimated amortization expense	204
2017 estimated amortization expense	185
2018 estimated amortization expense	154
2019 estimated amortization expense	$ 145