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Goodwill and Specifically Identifiable Intangible Assets (Future estimated amortization of specifically identifiable intangible assets) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Goodwill and Specifically Identifiable Intangible Assets [Abstract]  
2018 $ 4
2019 4
2020 4
2021 4
2022 4
Thereafter $ 33