Debt Short-term Borrowings (Details) - Commercial Paper - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jul. 31, 2023	Apr. 30, 2023
Short-Term Debt [Line Items]
Commercial paper (par amount)	$ 390	$ 235
Average interest rate	5.29%	5.17%
Average remaining days to maturity	14 days	21 days