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Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Net Assets Measured At Fair Value On A Recurring Basis	$ 2,500	$ 2,500
Net Assets Measured At Fair Value On A Recurring Basis Measured Using Unobservable Input And Classified As Level3	$ 13	$ 37

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Net Assets Measured At Fair Value On A Recurring Basis

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Net Assets Measured At Fair Value On A Recurring Basis Measured Using Unobservable Input And Classified As Level3

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