Goodwill and Other Intangible Assets Impairment (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Apr. 30, 2020 |
Apr. 30, 2021 |
Apr. 30, 2019 |
|
| Indefinite-lived Intangible Assets [Line Items] | |||
| Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 13 | ||
| Intangible Assets, Net (Excluding Goodwill) | 635 | $ 676 | $ 645 |
| Chambord [Member] | |||
| Indefinite-lived Intangible Assets [Line Items] | |||
| Intangible Assets, Net (Excluding Goodwill) | $ 104 | $ 104 |