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Debt and Credit Facilities (Schedule of Long-Term Debt) (Details) € in Millions, £ in Millions, $ in Millions	12 Months Ended
	Apr. 30, 2026 USD ($)	Apr. 30, 2025 USD ($)	Apr. 30, 2024 USD ($)	Apr. 30, 2026 EUR (€)	Apr. 30, 2026 GBP (£)	Apr. 30, 2025 EUR (€)	Apr. 30, 2025 GBP (£)
Debt Instrument [Line Items]
Total long term debt	$ 2,434	$ 2,421
Current portion of long-term debt	351	0
Long-term debt	2,083	2,421
Repayment of long-term debt	$ 0	$ 300	$ 0
1.20% senior notes, due July 7, 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| €				€ 300		€ 300
Debt Instrument, Maturity Date	Jul. 07, 2026	Jul. 07, 2026
Debt Instrument, Interest Rate, Stated Percentage	1.20%	1.20%		1.20%	1.20%	1.20%	1.20%
Total long term debt	$ 351	$ 342
2.60% senior notes, due July 7, 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| £					£ 300		£ 300
Debt Instrument, Maturity Date	Jul. 07, 2028	Jul. 07, 2028
Debt Instrument, Interest Rate, Stated Percentage	2.60%	2.60%		2.60%	2.60%	2.60%	2.60%
Total long term debt	$ 404	$ 401
4.75% senior notes, due April 15, 2033 {Member}
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 650	$ 650
Debt Instrument, Maturity Date	Apr. 15, 2033	Apr. 15, 2033
Debt Instrument, Interest Rate, Stated Percentage	4.75%	4.75%		4.75%	4.75%	4.75%	4.75%
Total long term debt	$ 645	$ 644
4.00% senior notes, due April 15, 2038 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 300	$ 300
Debt Instrument, Maturity Date	Apr. 15, 2038	Apr. 15, 2038
Debt Instrument, Interest Rate, Stated Percentage	4.00%	4.00%		4.00%	4.00%	4.00%	4.00%
Total long term debt	$ 296	$ 296
3.75% senior notes, due January 15, 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 250	$ 250
Debt Instrument, Maturity Date	Jan. 15, 2043	Jan. 15, 2043
Debt Instrument, Interest Rate, Stated Percentage	3.75%	3.75%		3.75%	3.75%	3.75%	3.75%
Total long term debt	$ 248	$ 248
4.50% senior notes, due July 15, 2045 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500	$ 500
Debt Instrument, Maturity Date	Jul. 15, 2045	Jul. 15, 2045
Debt Instrument, Interest Rate, Stated Percentage	4.50%	4.50%		4.50%	4.50%	4.50%	4.50%
Total long term debt	$ 490	$ 490