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Goodwill and Intangible Assets Goodwill and Intangible Assets (Schedule of Core Deposit Intangible Estimated Future Amortization Expense (Details) - Core deposit intangible - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]    
2019 $ 2  
2020 1  
2021 1  
Total $ 4 $ 6