Fair Value Measurements (Details) - USD ($) $ in Millions	Jul. 31, 2022	Apr. 30, 2022	Jul. 31, 2021
Assets:
Cash and cash equivalents at end of period	$ 899	$ 868	$ 1,172
Cash and cash equivalents, Fair Value	899	868
Liabilities:
Long-term debt (including current portion), Carrying Amount	2,248	2,269
Fair Value, Inputs, Level 2 [Member]
Assets:
Currency derivatives, net, Fair Value	57	48
Liabilities:
Currency derivatives, net, Fair Value	0	1
Long-term debt (including current portion), Fair Value	2,221	2,239
Foreign Exchange Contract [Member]
Assets:
Currency derivatives, net, Carrying Amount	57	48
Liabilities:
Currency derivatives, net, Carrying Amount	$ 0	$ 1

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Carrying amount as of the balance sheet date of the asset arising from derivative instruments and hedging activities, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer.

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Sum as of the balance sheet date of the (a) fair values of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and (b) the carrying amounts of the liabilities arising from financial instruments or contracts used to mitigate a specified risk (hedge), and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

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Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

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Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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