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Stockholders' Equity
 6 Months Ended
Oct. 31, 2017
Stockholders' Equity Attributable to Parent [Abstract]  
Stockholders' Equity Note Disclosure [Text Block]
Stockholders’ Equity
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



Retirement of Treasury Stock. On May 24, 2017, we retired 67,000,000 shares of Class B common stock previously held as treasury shares. This retirement reduced the number of issued shares of Class B common stock by that same amount.

Dividends. 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

As announced on November 16, 2017, our Board of Directors increased the quarterly cash dividend on our Class A and Class B common stock from $0.1825 per share to $0.1975 per share. Stockholders of record on December 7, 2017, will receive the cash dividend on January 2, 2018.

Accumulated Other Comprehensive Income. 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
)