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Derivative Instruments - Non Designated Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Other income, net | Foreign currency forward contracts | Not designated as hedging instrument |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pretax gain (loss) on derivative instruments | $ 13 | $ 33 | $ 48 | $ 58

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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