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Goodwill and Other Intangibles (Estimated Amortization Expense) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2020 $ 58
2021 56
2022 49
2023 42
2024 $ 30