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Goodwill and Intangible Assets (Expected Amortization Expense of Intangibles) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2020 $ 32
2021 28
2022 23
2023 23
2024 23
Beyond 2024 $ 304