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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Long-term Investments [Abstract] |  |  |
Pre-Tax Income (Loss) from Leases | $ 18 | $ (39) | $ 17
Income Tax Expense (Benefit) on Income from Leases | $ 2 | $ (22) | $ 6

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