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Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Millions | Mar. 31, 2020 | Mar. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net assets measured at fair value on a recurring basis | $ 2,700 | $ 2,300
Net assets measured at fair value on a recurring basis measured using unobservable input and as Level 3 | $ 19 | $ 2

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- Definition Net Assets Measured At Fair Value On A Recurring Basis Measured Using Unobservable Input And Classified As Level3 + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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