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Intangible Assets and Goodwill (Estimated Future Annual Amortization Expense for Intangible Assets) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 30
2019 27
2020 22
2021 15
2022 11
Thereafter 2
Net Carrying Value $ 107