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Long-Term Investments (Schedule Of Pre-Tax Income And Income Tax Effects Related To Investments In Leveraged Leases) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Long-Term Investments [Abstract] |  |  |
Pre-Tax Income (Loss) from Leases | $ 13 | $ 13 | $ 18
Income Tax Expense (Benefit) on Income from Leases | $ 3 | $ 3 | $ 2

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