Derivative Financial Instruments and Hedging Activities (Fair Value of Derivatives in a Gain (Loss) Position) (Details) - USD ($) $ in Millions	Apr. 30, 2025	Apr. 30, 2024
Fair values of derivative instruments
Derivative Asset, Fair Value, Gross Asset	$ 4	$ 12
Derivative Liability, Fair Value, Gross Liability	(14)	(4)
Currency derivatives [Member] \| Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Other Current Assets [Member]
Fair values of derivative instruments
Derivative Asset, Fair Value, Gross Asset		11
Derivative Liability, Fair Value, Gross Liability		(2)
Currency derivatives [Member] \| Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Other Assets [Member]
Fair values of derivative instruments
Derivative Asset, Fair Value, Gross Asset		1
Derivative Liability, Fair Value, Gross Liability		(1)
Currency derivatives [Member] \| Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Accrued expenses [Member]
Fair values of derivative instruments
Derivative Asset, Fair Value, Gross Asset	2
Derivative Liability, Fair Value, Gross Liability	(11)
Currency derivatives [Member] \| Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Other Liabilities [Member]
Fair values of derivative instruments
Derivative Asset, Fair Value, Gross Asset	0
Derivative Liability, Fair Value, Gross Liability	(3)
Currency derivatives [Member] \| Not designated as hedges [Member] \| Other Current Assets [Member]
Fair values of derivative instruments
Derivative Asset, Fair Value, Gross Asset	2
Derivative Liability, Fair Value, Gross Liability	$ 0
Currency derivatives [Member] \| Not designated as hedges [Member] \| Accrued expenses [Member]
Fair values of derivative instruments
Derivative Asset, Fair Value, Gross Asset		0
Derivative Liability, Fair Value, Gross Liability		$ (1)