Derivative Financial Instruments and Hedging Activities (Textual) (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Apr. 30, 2021 |
Apr. 30, 2020 |
|
| Derivative Instruments and Hedging Activities [Line Items] | ||
| Maximum Remaining Maturity of Foreign Currency Derivatives | 36 months | 36 months |
| Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | $ (12) | |
| Derivative, Net Liability Position, Aggregate Fair Value | 30 | $ 2 |
| Foreign Exchange Contract [Member] | ||
| Derivative Instruments and Hedging Activities [Line Items] | ||
| Derivative, Notional Amount | 1,218 | 1,026 |
| Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | ||
| Derivative Instruments and Hedging Activities [Line Items] | ||
| Debt Instrument, Face Amount | $ 680 | $ 613 |