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Goodwill and Intangible Assets - Intangible Asset Amortization Expense, Fiscal Year Maturity (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Fiscal year:    
Remaining 2020 $ 22  
2021 26  
2022 6  
2023 2  
Net Carrying Amount $ 56 $ 62