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Goodwill and Specifically Identifiable Intangible Assets (Future estimated amortization of specifically identifiable intangible assets) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Goodwill and Specifically Identifiable Intangible Assets [Abstract]  
2019 $ 26
2020 37
2021 37
2022 37
2023 37
Thereafter $ 477