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Estimates (Estimated Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 $ 279  
2018 277  
2019 273  
2020 268  
2021 251  
Gross Carrying Amount $ 6,512 $ 5,642