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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Long-term Investments [Abstract] |  |  |
Pre-Tax Income (Loss) from Leases | $ (69) | $ (135) | $ 12
Income Tax Expense (Benefit) on Income from Leases | $ (26) | $ (51) | $ 5

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- Definition Pretax lease income allocated in proportionate amounts from unearned income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77888424&loc=SL77920237-209979 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77907235&loc=d3e45152-112736 + Details
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- Definition The tax effect from the current year income from arrangements meeting the criteria for classification as a leveraged lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77888424&loc=SL77920237-209979 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77907235&loc=d3e45152-112736 + Details
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