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Intangible Assets and Goodwill (Estimated Future Annual Amortization Expense for Intangible Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Intangible Assets and Goodwill [Abstract]    
2016 $ 37  
2017 33  
2018 31  
2019 29  
2020 23  
Thereafter 28  
Net Carrying Value $ 181 $ 227