Debt Short-term Borrowings (Details) - Commercial Paper - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Jan. 31, 2024	Apr. 30, 2023
Short-Term Debt [Line Items]
Commercial paper (par amount)	$ 730	$ 235
Average interest rate	5.48%	5.17%
Average remaining days to maturity	20 days	21 days