Fair Value Measurements (Tables)

9 Months Ended

Jan. 31, 2020

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following table summarizes the assets and liabilities measured or disclosed at fair value on a recurring basis:

	April 30, 2019				January 31, 2020
	Carrying		Fair		Carrying		Fair
(Dollars in millions)	Amount		Value		Amount		Value
Assets
Cash and cash equivalents	$	307	$	307	$	276	$	276
Currency derivatives	40		40		50		50
Liabilities
Currency derivatives	6		6		9		9
Short-term borrowings	150		150		4		4
Long-term debt	2,290		2,399		2,293		2,621