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Derivative Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Cash Flow Hedging [Member] |  |
Derivative Instruments and Hedging Activities Disclosures |  |
Gain from Components Excluded from Assessment of Cash Flow Hedge Effectiveness | $ 25 | $ 10
Designated as Hedging Instrument [Member] |  |
Derivative Instruments and Hedging Activities Disclosures |  |
Foreign Currency Forward And Option Contracts Maximum Maturity Period | 18 months |
Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments and Hedging Activities Disclosures |  |
Foreign Currency Forward And Option Contracts Maximum Maturity Period | 3 months |

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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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- Definition The gain relating to components of the gain (loss) on the cash flow hedging instrument excluded from the assessment of cash flow hedge effectiveness. Recognized in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Maximum amount of time remaining before foreign currency exchange rate derivatives mature or expire, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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