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Basis Of Presentation And Recently Issued Accounting Pronouncements (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Basis Of Presentation And Recently Issued Accounting Pronouncements [Abstract] |  |
Net unrealized gain or loss on foreign-currency transactions of intercompany loan hedges | $ 0 | $ (3)
Employee Service Share Based Compensation Incremental Tax Benefit To Be Realized From Exercise Of Stock Awards | $ 56 |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  | $ 9

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- Definition Basis Of Presentation And Recently Issued Accounting Pronouncements [Abstract] + References No definition available. + Details
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- Definition Employee service share based compensation incremental tax benefit to be realized from exercise of stock awards. + References No definition available. + Details
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- Definition Net unrealized gain or loss on foreign-currency transactions of intercompany loan hedges. + References No definition available. + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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