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Goodwill and Intangible Assets - Intangible Asset Amortization Expense, Fiscal Year Maturity (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Fiscal year:    
Remaining 2019 $ 43  
2020 44  
2021 18  
2022 2  
2023 1  
Net Carrying Amount $ 108 $ 92