Fair Value Measurements (Tables)

9 Months Ended

Jan. 31, 2019

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, 2018				January 31, 2019
	Carrying		Fair		Carrying		Fair
(Dollars in millions)	Amount		Value		Amount		Value
Assets
Cash and cash equivalents	$	239	$	239	$	260	$	260
Currency derivatives	1		1		24		24
Liabilities
Currency derivatives	39		39		3		3
Short-term borrowings	215		215		207		207
Long-term debt	2,341		2,386		2,301		2,361