Fair Value Measurements (Tables)

12 Months Ended

Apr. 30, 2018

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:

	2017				2018
April 30,	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Cash and cash equivalents	$	182	$	182	$	239	$	239
Currency derivatives	25		25		1		1
Liabilities:
Currency derivatives	10		10		39		39
Short-term borrowings	211		211		215		215
Current portion of long-term debt	249		249		—		—
Long-term debt	1,689		1,752		2,341		2,386