Fair Value Measurements (Tables)

12 Months Ended

Apr. 30, 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:

	2018				2019
April 30,	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Cash and cash equivalents	$	239	$	239	$	307	$	307
Currency derivatives	1		1		40		40
Liabilities:
Currency derivatives	39		39		6		6
Short-term borrowings	215		215		150		150
Long-term debt	2,341		2,386		2,290		2,399