Fair Value Measurements (Tables)

6 Months Ended

Oct. 31, 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:

	April 30, 2018				October 31, 2018
	Carrying		Fair		Carrying		Fair
(Dollars in millions)	Amount		Value		Amount		Value
Assets
Cash and cash equivalents	$	239	$	239	$	193	$	193
Currency derivatives	1		1		31		31
Liabilities
Currency derivatives	39		39		6		6
Short-term borrowings	215		215		258		258
Long-term debt	2,341		2,386		2,288		2,294