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Goodwill and Other Intangible Assets (Expected Amortization Expense) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2020 $ 44
2021 40
2022 31
2023 26
2024 24
Computer Software, Intangible Asset [Member]  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2020 34
2021 31
2022 22
2023 17
2024 15
Contract-Based Intangible Assets [Member]  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2020 4
2021 4
2022 4
2023 4
2024 4
Other  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2020 6
2021 5
2022 5
2023 5
2024 $ 5