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Goodwill and Intangible Assets -Schedule Of Future Amortization Expenses (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2019 $ 252
2020 244
2021 223
2022 217
2023 $ 214