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Intangible Assets (Schedule of Estimated Amortization of Intangibles for the Next Five Years) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]  
2017 $ 681
2018 678
2019 667
2020 489
2021 $ 453