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Goodwill and Other Intangibles (Estimated Amortization Expense) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2017 $ 68
2018 65
2019 62
2020 62
2021 $ 52