Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Apr. 30, 2021

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, 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
Sale of business (Note 12)	(4)		(1)
Acquisition of business (Note 12)	8		8
Foreign currency translation adjustment	19		34
Balance as of April 30, 2021	$	779	$	676