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Goodwill and Other Intangibles Goodwill and Other Intangibles (Future Amortization Expense) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Estimated future amortization expense - 2020 $ 70
Estimated future amortization expense - 2021 65
Estimated future amortization expense - 2022 57
Estimated future amortization expense - 2023 41
Estimated future amortization expense - 2024 $ 34