Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Apr. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill [Table Text Block]

The following table shows the changes in goodwill (which include no accumulated impairment losses) and other intangible assets over the past two years: 

	Goodwill			Other Intangible Assets
Balance as of April 30, 2018	$	763		$	670
Foreign currency translation adjustment	(10		)	(25		)
Balance as of April 30, 2019	753			645
Acquisition of business (Note 12)	11			12
Foreign currency translation adjustment	(8		)	(9		)
Impairment	—			(13		)
Balance as of April 30, 2020	$	756		$	635