Stockholders' Equity (Tables)

6 Months Ended

Oct. 31, 2017

Stockholders' Equity Attributable to Parent [Abstract]

Schedule of Stockholders Equity [Table Text Block]

The following table summarizes the changes in stockholders’ equity during the six months ended October 31, 2017:

(Dollars in millions)	Class A Common Stock		Class B Common Stock			Additional Paid-in Capital			Retained Earnings			AOCI			Treasury Stock			Total
Balance at April 30, 2017	$	25	$	43		$	65		$	4,470		$	(390	)	$	(2,843	)	$	1,370
Retirement of treasury stock			(10		)	(8		)	(2,684		)				2,702			—
Net income									417									417
Net other comprehensive income (loss)												(1		)				(1		)
Cash dividends									(140		)							(140		)
Acquisition of treasury stock															(1		)	(1		)
Stock-based compensation expense						9												9
Stock issued under compensation plans															10			10
Loss on issuance of treasury stock issued under compensation plans						(17		)										(17		)
Balance at October 31, 2017	$	25	$	33		$	49		$	2,063		$	(391	)	$	(132	)	$	1,647

Dividends Declared [Table Text Block]

The following table summarizes the cash dividends declared per share on our Class A and Class B common stock during the six months ended October 31, 2017:

Declaration Date	Record Date	Payable Date	Amount per Share
May 24, 2017	June 5, 2017	July 3, 2017	$0.1825
July 27, 2017	September 7, 2017	October 2, 2017	$0.1825

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The following table summarizes the changes in each component of AOCI, net of tax, during the six months ended October 31, 2017:

(Dollars in millions)	Currency Translation Adjustments			Cash Flow Hedge Adjustments			Postretirement Benefits Adjustments			Total AOCI
Balance at April 30, 2017	$	(204	)	$	11		$	(197	)	$	(390	)
Net other comprehensive income (loss)	9			(16		)	6			(1		)
Balance at October 31, 2017	$	(195	)	$	(5	)	$	(191	)	$	(391	)