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Goodwill and Other Intangible Assets (Expected Amortization Expense) (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |
2019 | $ 45
2020 | 40
2021 | 29
2022 | 23
2023 | 17
Computer Software, Intangible Asset [Member] |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |
2019 | 33
2020 | 28
2021 | 19
2022 | 13
2023 | 7
Contract-Based Intangible Assets [Member] |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |
2019 | 4
2020 | 4
2021 | 4
2022 | 4
2023 | 4
Other |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |
2019 | 8
2020 | 8
2021 | 6
2022 | 6
2023 | $ 6

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