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Goodwill and Other Intangible Assets (Tables)
3 Months Ended
Jul. 31, 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 includes no accumulated impairment losses) and other intangible assets during the three months ended July 31, 2021:
(Dollars in millions)Goodwill
Other Intangible Assets
Balance at April 30, 2021
$779 $676 
Foreign currency translation adjustment(1)(6)
Balance at July 31, 2021
$778 $670