Derivative Financial Instruments and Hedging Activities (Fair Value of Derivatives) (Details) - USD ($) $ in Millions	Jul. 31, 2026	Apr. 30, 2026
Fair values of derivative instruments
Derivative Asset, Fair Value, Gross Asset	$ 5	$ 4
Gross Amount of Derivative Liabilities	(18)	(17)
Currency derivatives [Member] \| Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Balance Sheet Location [Axis]: us-gaap:AccountsPayableAndOtherAccruedLiabilitiesCurrent
Fair values of derivative instruments
Derivative Asset, Fair Value, Gross Asset	4	2
Gross Amount of Derivative Liabilities	(11)	(15)
Currency derivatives [Member] \| Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent
Fair values of derivative instruments
Derivative Asset, Fair Value, Gross Asset	1	1
Gross Amount of Derivative Liabilities	(1)	(2)
Currency derivatives [Member] \| Designated as Hedging Instrument [Member] \| Net Investment Hedging [Member] \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent
Fair values of derivative instruments
Derivative Asset, Fair Value, Gross Asset	0	0
Gross Amount of Derivative Liabilities	(2)	0
Currency derivatives [Member] \| Not designated as hedges [Member] \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent
Fair values of derivative instruments
Derivative Asset, Fair Value, Gross Asset	0	1
Gross Amount of Derivative Liabilities	0	0
Currency derivatives [Member] \| Not designated as hedges [Member] \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Fair values of derivative instruments
Derivative Asset, Fair Value, Gross Asset	0	0
Gross Amount of Derivative Liabilities	$ (4)	$ 0