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Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Fair Value Disclosures [Abstract] |  |
Net Assets Measured At Fair Value On A Recurring Basis | $ 2,600 | $ 2,600
Net Assets Measured At Fair Value On A Recurring Basis Measured Using Unobservable Input And Classified As Level3 | $ 7 | $ 1

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