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Goodwill and Other Intangible Assets - Expected Expense Related to Intangibles Amortization in Future Periods (Details) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 5  
2020 5  
2021 4  
2022 4  
2023 3  
Net Carrying Amount $ 21 $ 26