Debt Short-term Borrowings (Details) - Commercial Paper - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Oct. 31, 2024	Apr. 30, 2024
Short-Term Debt [Line Items]
Commercial paper (par amount)	$ 514	$ 429
Average interest rate	4.93%	5.49%
Average remaining days to maturity	24 days	12 days

Weighted average interest rate of short-term debt outstanding calculated at point in time.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-7

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant